If it helps anyone... I tried one of these in York, size 44. I'm 5' 11" with a 36" waist and slim/medium build with a fairly long body and the 44 was a great fit with just enough room for a t-shirt and jumper (not that you'd need a jumper) while the sleeves were wide enough for my arms to go in without being tight under the armpit (unlike some *cough*Super Dry*cough*).
@gibblesuk true. OK if you live near a store, but might cost a bit to return as it's heavy. Although still cheaper than any alternatives I've seen!
Nice jacket :-)
Smoke me a kipper XD
If it was Amazon with easy return I would try. Fit is difficult without trying first