Cheers for all the help and ideas so far.
The uniform has changed massively over the years, it's more like Army geat in dark blue now, if I could find some without assault rifles I guess modern British Light Infantry would be best best place to start a conversion. I guess I'm really looking for the shirt sleeves and body armour look, the helmet would be a cheeky bonus. Like these characters:
http://www.thebill.com/999 would be an option, but I've not finished my Atomic-1:56-izing Super Ray, yet.
I'll get some 70's Coppers as soon as they are available, but it's 21st Century ones I'm looking for now. Geezers, Shut it! sounds fantastic.