Having worked on DPM schemes for the SAS, I also did some figures representing the Royal Marines Mountain and Arctic Warfare cadre. These are painted the same way as the SAS, but I used uniform green for the berets - not sure it's exactly right, but I wanted it to stand out on the models and the brighter green seems to work for that. All the figures wear light denim trousers.
First up, two packs Stonewall Figures Royal Marines from their Falklands range. Nice figures with a useful Charlie G armed figure. I struck lucky with one pack which was supplied with an extra figure.
And then the TQD castings offering from C P Models. These are supplied with two options, helmets or berets and these are the beret versions. They are supplied with separate heads, except the figure firing, who has a spare beret head supplied but has a cast head wearing a helmet - I kept him in his helmet.
These, and the SAS posted previously, should be useful for a variety of scenarios set throughout the 70's, 80's and into the 90's.
Thanks for looking.