I can be very parochial in my posts but in searching for cool places to go snorkelling I found this video from the Kerry coast where the warm gulf stream meets the shallows you can find some exotic species you wouldnt expect to find so far north. The quality is very good and the vid is quite beautiful I think. Amazing just how much life is just beneath the surface! I've just noticed the Youtube feature to allow watching in high quality, hopefully this is it, you might want to pause and let it load a little, its worth it.