Bobbies enforcing search warrants, LOL. Your source for this is?
That's not what I said. I said that when the Bobbies call for backup, the backup is always heavily armed; and I pointed out the two gentlemen with submachine guns. How much do you know about police procedures in the US, UK and Canada? Most of the major metro areas have a backup team (sometimes described as an Emergency Response Team) that is heavily armed, and routinely deployed when executing search warrants on locations where suspects are believed to have automatic weapons or explosives.
Of course it turned out to be ridiculous in this case, since the alleged "mortar" was a miniature, and a plastic toy.