Thanks Barrie, that's an offer I'm going to have to take up sometime. It is a lump of cash, but I found my way to the Abyss website where their lump was £880 and 3.2Kg! I'd love to know if anyone uses them...
DD, LOL! Not what I expected but a nice guy nonetheless. I hope they all enjoyed the other two day's diving - the weather was pretty crap.