Pretty brave of the officers! Potentially known BOMB suspect, chase him down, and pile on top of him. Put 5 shots into him hoping the possible switch is not a "dead-man" type. I had no idea the Brits had such folk on the constabulary. SAS and SBS are some of the most formidible troops on the planet, but ya just think of a "Bobby" as kindly with the little hat and truncheon.
Good job guys! Get the intel, make'em pay!
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Anti-terror cops in the UK are taught Close Quarter Battle tactics (ie what those guys just did) by the SAS. So either way what you are looking at there is standard SAS CQB stuff.
These officers were probably SAS or on loan from the SAS.