Radiohead's Colin Greenwood among thousands to take part in triathlon

Participants will be swimming across the lake in the grounds, then cycling and running around the palace.

There are two routes – the shorter route is a 400m swim, a 13.2km bike ride and a 3.1km run, whereas the longer route consists of a 750m swim, a 19.8km bike ride and a 5.7km run.

Among those taking part is Radiohead bassist Colin Greenwood, who is part of the charity team Scarlett’s Dragons, who are raising money for Leukaemia and Lymphoma research.