Don't remember it being overly warm there, in the early 20s but nothing too hot IIRC. The sea swim was pretty straightforward, nothing like as swelly as Wales, although I'd recommend not doing 3.7k of it with a broken zip, tends to drag you back a bit and there's a touch of chaffing!
Going back a few years, used to love it when the forum picked another often utterly irrelevant forum to invade, usually between Christmas and New Year, started off with RW USA I think, a bunch of ridiculous threads started, many arguments and the fun of it being that their mods were tucked up in bed for the bulk of it, one other 'attack' was on a knitting forum IIRC, them were't days
Wasn't the USA invasion reciprocated at one point?
Sounds familiar, not sure they managed such good numbers though