yeah thats where i got mine done, best of giving a few a ring and seeing, i know snapon used to sell the the kit for about 320 dunno if they still do or not as a mate told me about it.
does it still run ok? you might have a hole in the rad or top hose, just small enough for it to jet a little out and no leave anyu sign as the heat evaporates it
happened to me a few times and it turned out to be a small hole just next to/just under edge of jubile clip on top rad hose