I think the answer is, the BBC wardrobe dept found the first one that fitted. That second photo doesn't even look like a military beret - sweatband is wrong. And they are all too small for WW2 pattern. Were I doing this guy, I'd paint it black. Certainly not green. In the Far East the beret wasn't that popular for obvious reasons of high temperatures and hot sun. Must've been a bugger wearing it under those studio lights - no wonder he was always sweating!
It's a great bust and you are doing it full justice mate.
It's a great bust and you are doing it full justice mate.