I think this started in late 2011/early 2012 in the build up to the olympics.
Like the pointless silver stumps, this is all about presenting an image of London as a 'safe place' & nothing to do with finding a sensible solution to a known problem.
Unless anyone can explain how stumps and automatic weapons would achieve anything in the face of a
suicide bomber carrying a rucsac.
Met police don't exactly have a very good record when it comes to use of firearms against
suspected terrorists..
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If you want to know the armed police I've seen in London now carry either;
HK416 or MP5, both with scout ACOG style sighting scopes, usually with torch/laser also attached onto the rails.
Glock 17 or Glock 19, sometimes a Sig Sauer P227.
They're also armed with a taser and some form of chemical restraint.
I beleive the HK416 has replaced the role of the previous G36c, but I am seeing a lot wider spread use of the HK416 than I ever saw with the G36.
regardless if they're HK416,MP5,Glock 17,Glock 19,Sig Sauer P227,G36c
the end result is still a tragedy.