Next month there is to be a mass swimming event in the open chilly waters of the Serpentine lake in Hyde Park.
Normally, swimming in the lake is only open to members of the local swimming club — who famously take a dip on Christmas Day — but over the weekend of 24th/25th September, the general public will be allowed in as well.
Personally, a lake is something to decorously drift across in a boat while holding a gin and tonic and watching someone else do all the hard work, but I understand that there some for whom getting into the water is also desirable.
If you are so minded to be energetic, then the ballot for places is now open, and closes on — well, they say Friday, I say Thursday — the 25th August, or when the remaining 1,500 tickets are snapped up.
Entry is £39.
For the watchers on the sidelines, there will be grandstands in the event area for the public to use as well as spectator areas around the Serpentine.