D1645 (47830) passes Islip on 16 July 2026 with the Steam Dreams 1Z61 10:13 Paddington to Princes Risborough 'Spirit of Summer Lunch' railtour. D1924 (47810) Crewe Diesel Depot is bringing up the rear. D1645 was substituting for BR 8P 4-6-2 71000 Duke of Gloucester, as there was a ban on using steam locomotives on the mainline, due to the heatwave.