50008 Thunderer passes Islip on 17 May 2025 with the UK Railtours 1Z66 08:35 Princes Risborough (from Chinnor) to Northampton 'Thundering Shed' railtour. 66126 Driver Jack Mills is at the rear of the London Underground liveried 4-TC set. The train would return an hour later, after reversing at Oxford.