Obviously anyone rocking MC kit is 99% SF, the blokes in the grey we've seen before, the black and jeans.. not sure, could be a secretive, well equipped police unit, but I don't think I've seen any police in Cryes yet (though I don't go searching). There's other pictures floating around of SF blokes in Black G3 combats with MC load bearing gear.
I think the fact we've had to resort to all these army blokes on the streets is just a result of the cuts to police and lack of budget to give more (or all) police firearms training. Since afghan finished, there will be lots of army units sat around doing nothing. Bit surprised they were told to use their ratty training kit instead of Osprey or Virtus. Even I have an osprey mk4 sat in the loft, infantry blokes must have their own personal issued ones. The fact we're still throwing away money buying ECBAs is silly, but then it's probably kevlar from the 80s stuffed in to new MTP covers.
I'm surprised it's not been more of a thing in terms of "army on the streets! with guns! I'm offended!". I'm alright with it at this level, they're not stopping anyone living their lives and I know if I had to do the same job how I'd approach it (i.e. I've got no interest in restricting any member of the public in any way, I want to do my shift and come home). But obviously you don't want to start down a slippery slope.