I witnessed something remarkable on the first Sunday of “Lockdown Part 2”. It was an unusually warm and pleasant autumn day: sunny, no wind and unseasonably mild at around 17 degrees. Still, this was November in the UK, the days were short and the sun was unable to make much impact on the water temperature in the Thames. A few days previously, this had dropped below 10 degrees and it wasn’t showing any signs of regaining double figures.