I did my rating with "The Amphibious Flying Club" at ST Angelo Enniskillen under the instruction of Steve Powell and can't recommend it highly enough. My problem was that we struggled to find rough enough water on the loughs for the rough water training. I know we could have flown another couple of minutes and used the sea but this means having to wash the plane with fresh water all the time.
Its easier for me as I live in NI but lets face it in the UK the weather is always going to be a factor and there is great craic to be had around Enniskillen.