Hydrangea flowering

It’s a bit confusing, but the hydrangea seems to have flowered again. We have new flowers and leaves in November! We also have old leaves and flowers as normal. Global warming?
I have been on a WI trip to the Farnborough Wind Tunnels. The first tunnel was set up in 1906, 35 years after the first wind tunnel in Greenwich.
By 1935 they had developed significantly with air recirculation improving the process. The Tunnels kept changing to keep up with aircraft development until 1995 when they closed down. Saved from demolition by the Farnborough Air Services Trust, nowadays they are used for cinema and TV, and, of course, tours. An interesting visit.