It certainly cured my hangover! Only because I was more worried about stopping breathing because of the cold shock!
It was actually 16 degrees - so not that cold for some people - but I'm a wimp. I cheated a bit (or totally :-), before I jumped in I stood under hot shower and filled my wetsuit! :-)
Only managed 2 lengths, but that's OK for starters, it is a very very long pool.