I was in Stoney Wed night (7 deg) and had a couple of good dives in my new Arctic Commercial 200 Synthulate and Otter Britannic. Never felt the cold at all.
Added a couple of kilos to my weight belt though and kept a bit more air in the suit during the dives. 
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Diving, like life in general is easy on the way down, but it's the coming back up that poses the most difficulty. |