Hi John,
Would agree they tend to be of slight build but fit OK with , Tamiya, Accurate Armour, Ultracast and HobbyFan figs that I have.
Wouldn't used them mixed with Dragon, MB, or MiniArt , theirs tend to be bigger in all proportions.
Mind you Resicast have the biggest selection of British/Commonwealth Infantry and Tankers that I can think off. Strangely no crew for their 3" Mortar or MG Crew in BD to fit with the majority of the rest of the Company!
Wolf possibly make the best proportioned bodies, but they are very expesnive and have a very limited range of Commonwealth troops.
Provided you mix them appropriately they work well, but the odd set of broader shoulders would be good too.
Cheers
Al