I remembered last night that someone makes a 28mm WW2 Druid miniature, and I have tracked it down:
At first I was thinking 'bollocks - it is a para figure, and wont fit in with my commandos". Well, after doing a bit of digging around, I have discovered that the figure comes in multiple parts, and one has the option of two different heads and two sets of arms to choose from.
I know Warlord Games sells separate commando heads, so I could make a quick conversion. I then need to come up with a back story as to why a commando is wearing a para smock, but that can be as simple as "he is a druid... he can wear what he likes"
I am not convinced on this, but I will put it in to the back of my mind for a later date.