Uniform identification?

[Rob_Crane]

Forgive me if I'm treading into forbidden territory here, but am I right to assume that people in this forum are likely also pretty good at identifying uniforms?

I've got the attached photo of Combined Operations Pilotage Party 7 (COPP 7) taken on Hayling Island and would like to try and put some names to the faces, if I can.

First step to that is I think identifying service / ranks etc if possible. And that's way, way, way out of my comfort zone.

Is it okay to ask what people here think?

As well as navy ratings, COPP teams would include Royal Engineers and possibly SBS/Marines.

With thanks in advance for any help people can give.

(Chap bottom right is as you can tell from the label identified - his background was as a seaman with landing craft units.)