| 18 Nov 2025 | Informa Capital Markets Day - Visit to Dubai Air Show |   |   |   | 
                                
                                        | 17 Nov 2025 | Informa Capital Markets Day - Presentations |   |   |   | 
                                
                                        | 11 Nov 2025 | 2025 Ten-Month Trading Update |   |   |   | 
                                
                                        | 23 Jul 2025 | 2025 Half Year Results |  |  |  | 
                                
                                        | 19 Jun  2025 | 2025 AGM Presentation |  |  |  | 
                                
                                        | 17 Jun  2025 | 2025 AGM Trading Update |  |  |  | 
                                
                                        | 1 May 2025 | 2025 Q1 Trading Update |  |  |  | 
                                
                                        | 6 Mar 2025 | 2024 Full Year Results |  |  |  | 
                                
                                        | 19 Nov 2024 | 2024 Ten-Month Trading Update |  |  |  | 
                                
                                        | 24 Jul 2024 | 2024 Half Year Results |  |  |  | 
                                
                                        | 21 Jun 2024 | 2024 Annual General Meeting |  |  |  | 
                                
                                        | 8 Mar 2024 | 2023 Full Year Results |  |  |  | 
                                
                                        | 14 Nov 2023 | 2023 Ten-Month Trading Update |  |  |  | 
                                
                                        | 27 Jul 2023 | 2023 Half Year Results |  |  |  | 
                                
                                        | 15 Jun 2023 | 2023 AGM Trading Update |  |  |  | 
                                
                                        | 9 Mar 2023 | 2022 Full Year Results |  |  |  | 
                                
                                        | 14 Nov 2022 | 2022 Ten-Month Trading Update |  |  |  | 
                                
                                        | 4 Aug 2022 | 2022 Half-Year Results |  |  |  | 
                                
                                        | 16 Jun 2022 | 2022 AGM Trading Update |  |  |  | 
                                
                                        | 15 Mar 2022 | 2021 Full Year Results |  |  |  | 
                                
                                        | 7 Dec 2021 | 2021 Capital Markets Day |  |  |  | 
                                
                                        | 17 Nov 2021 | 2021 Ten-Month Trading Update |  |  |  | 
                                
                                        | 29 Jul 2021 | 2021 Half-Year Results |  |  |  | 
                                
                                        | 3 Jun 2021 | 2021 Annual General Meeting |  |  |  | 
                                
                                        | 22 April 2021 | 2020 Full Year Results |  |  |  | 
                                
                                        | 6 Jan 2021 | 2020 Year-End Update |  |  |  | 
                                
                                        | 21 Sep 2020 | 2020 Half Year Results |  |  |  | 
                                
                                        | 11 Nov 2019 | 2019 Ten-Month Trading Update |  |  |  | 
                                
                                        | 13 Sep 2019 | 2019 Interim Dividend Payment Date |  |  |  | 
                                
                                        | 24 Jul 2019 | 2019 Half Year Results |  |  |  | 
                                
                                        | 31 May 2019 | 2018 Final Dividend Payment Date |  |  |  | 
                                
                                        | 12 Jun 2020 | 2020 Annual General Meeting |  |  |  | 
                                
                                        | 12 Jun 2020 | June 2020 Trading Update |  |  |  | 
                                
                                        | 04 May 2020 | General Meeting - Allotment Authority |  |  |  | 
                                
                                        | 10 Mar 2020 | Full Year 2019 Results |  |  |  | 
                                
                                        | 24 May 2019 | 2019 Annual General Meeting |  |  |  | 
                                
                                        | 10 May 2019 | Investor Day 2019 |  |  |  | 
                                
                                        | 07 Mar 2019 | Full Year 2018 Results |  |  |  | 
                                
                                        | 09 Nov 2018 | 2018 Ten Month Trading Update |  |  |  | 
                                
                                        | 14 Sep 2018 | 2018 Interim Dividend Payment Date |  |  |  | 
                                
                                        | 25 Jul 2018 | Half Year 2018 Results |  |  |  | 
                                
                                        | 1 Jun 2018 | 2017 Final Dividend Payment Date |  |  |  | 
                                
                                        | 25 May 2018 | 2018 Annual General Meeting |  |  |  | 
                                
                                        | 28 Feb 2018 | Full Year 2017 Results |  |  |  | 
                                
                                        | 30 Jan 2018 | 2017 Trading Update |  |  |  | 
                                
                                        | 09 Nov 2017 | Ten Month 2017 Trading Update |  |  |  | 
                                
                                        | 15 Sep 2017 | 2017 Interim Dividend Payment Date |  |  |  | 
                                
                                        | 25 Jul 2017 | Half Year 2017 Results |  |  |  | 
                                
                                        | 15 Jun 2017 | Informa Investor Day |  |  |  | 
                                
                                        | 02 Jun 2017 | 2016 Final Dividend Payment Date |  |  |  | 
                                
                                        | 26 May 2017 | 2017 Annual General Meeting |  |  |  | 
                                
                                        | 06 Mar 2017 | Full Year 2016 Results |  |  |  | 
                                
                                        | 7 Nov 2016 | Nine Month 2016 Trading Update |  |  |  | 
                                
                                        | 26 Oct 2016 | Results of Rights Issue announced |  |  |  | 
                                
                                        | 11 Oct 2016 | Admission of Rights Issue Shares and dealings in Nil Paid Rights on the London Stock Exchange |  |  |  | 
                                
                                        | 10 Oct 2016 | General Meeting for Shareholders |  |  |  | 
                                
                                        | 09 Sep 2016 | 2016 Interim Dividend Payment Date |  |  |  | 
                                
                                        | 28 Jul 2016 | Half Year 2016 Results |  |  |  | 
                                
                                        | 26 May 2016 | 2015 Final Dividend Payment Date |  |  |  | 
                                
                                        | 19 May 2016 | 2016 AGM Trading Update |  |  |  | 
                                
                                        | 19 May 2016 | 2016 Annual General Meeting |  |  |  | 
                                
                                        | 11 Feb 2016 | Full Year 2015 Results |  |  |  | 
                                
                                        | 18 Nov 2015 | Investor Day 2015 |  |  |  | 
                                
                                        | 20 Oct 2015 | Nine-Months 2015 Trading Update |  |  |  | 
                                
                                        | 11 Sep 2015 | 2015 Interim Dividend Payment Date |  |  |  | 
                                
                                        | 28 Jul 2015 | Half Year 2015 Results |  |  |  | 
                                
                                        | 28 May 2015 | 2014 Final Dividend Payment Date |  |  |  | 
                                
                                        | 22 May 2015 | 2015 Annual General Meeting |  |  |  | 
                                
                                        | 21 Apr 2015 | First Quarter 2015 Trading Update |  |  |  | 
                                
                                        | 12 Feb 2015 | Full Year 2014 Results |  |  |  | 
                                
                                        | 06 Nov 2014 | 2014 Investor Day Presentation |  |  |  | 
                                
                                        | 21 Oct 2014 | Nine Month 2014 Interim Management Statement |  |  |  | 
                                
                                        | 29 Jul 2014 | Half Year 2014 Results |  |  |  | 
                                
                                        | 27 May 2014 | Second Interim Dividend |  |  |  | 
                                
                                        | 23 May 2014 | 2014 Annual General Meeting |  |  |  | 
                                
                                        | 15 May 2014 | First Quarter 2014 Interim Management Statement |  |  |  | 
                                
                                        | 21 Feb 2014 | Full Year 2013 Results |  |  |  | 
                                
                                        | 21 Oct 2013 | Nine Month 2013 Interim Management Statement |  |  |  | 
                                
                                        | 30 Jul 2013 | Half Year 2013 Results |  |  |  | 
                                
                                        | 22 Apr 2013 | First Quarter 2013 Interim Management Statement |  |  |  | 
                                
                                        | 21 Feb 2013 | Full Year 2012 Results |  |  |  | 
                                
                                        | 16 Oct 2012 | Nine Month 2012 Interim Management Statement |  |  |  | 
                                
                                        | 25 Jul 2012 | Half Year 2012 Results |  |  |  | 
                                
                                        | 21 May 2012 | First Quarter 2012 Interim Management Statement |  |  |  | 
                                
                                        | 21 May 2012 | Investor Teach In |  |  |  | 
                                
                                        | 23 Feb 2012 | Full Year 2011 Results |  |  |  | 
                                
                                        | 26 Oct 2011 | Nine Month 2011 Interim Management Statement |  |  |  | 
                                
                                        | 26 Jul 2011 | Half Year 2011 Results |  |  |  | 
                                
                                        | 12 May 2011 | First Quarter 2011 Interim Management Statement |  |  |  | 
                                
                                        | 22 Feb 2011 | Full Year 2010 Results |  |  |  | 
                                
                                        | 17 Nov 2010 | Nine Month 2010 Interim Management Statement |  |  |  | 
                                
                                        | 27 Jul 2010 | Half Year 2010 Results |  |  |  | 
                                
                                        | 28 Apr 2010 | First Quarter 2010 Interim Management Statement |  |  |  | 
                                
                                        | 02 Mar 2010 | Full Year 2009 Results |  |  |  |