Dress uniform, olive green combats or camouflage?
Both the green and DPM (camo) were '60 pattern (DPM also called '66 pattern) the jackets can still be obtained, trousers not so much:
http://server.microlite16.com/josephs-militaria-and-homefront-collection.co.uk/PAGE47.HTML
The webbing used was '58 pattern, comprising belt, yoke, left ammo pouch and right ammo pouch.
The beret appears to be a standard 'SAS' issue beret.
Helmets, when worn were the steel Mk IVs, usually with green string covers.
Boots were either black ammo boots, or boots DMS. Sgt Maj Benson can be seen wearing brown boots (a distinct no-no!).
Also worn were canvas gaiters.
The shirt would be the shirt mans wool og or the Shirt KF (khaki flannel).
The Jersey Heavy Wool is a standard, but the version without lapels.
Scrim scarves in olive green.
Weapon of choice would be either the L2A3 SMG (Sterling) or the L1A1 SLR (FN FAL), with wooden furniture. Officers would, of course, carry the L9A1 Browning 9mm.
I'll dig through for some reference pics. I have '68 pattern combats that are similar, Shirt OG and Shirt KF, tie wool, Mk IV helmet, '58 pattern belt, Boots ammo and Boots DMS etc if you want detailed pics.