RM Commandos in 6 mm

[jon_1066]

So having got all the stuff together for a D-Day game I am looking at other alternative scenarios using it or adding to it.  To that end I need to source some Royal Marine Commandos as they feature heavily both on D-Day and in other amphibious landings. 

All the footage I've seen has them in a mix of berets and tin hats.  For the helmeted ones at this scale standard British infantry should be fine but where to source their bereted brethren?  Any ideas?