The BBC link is about specialist firearms officers which we already have. Their numbers will increase. The turn up in particular situations like potential terrorist attacks, hostage taking, taking over a building threatening to kill everyone, riots etc. I've never seen an armed police officer and I doubt many have in this country.
I take on board everything you said Rose and agree, I'd hate to see a Bobby on the beat carrying a gun, but we won't notice the armed police unless something very serious happens wherever we are, in which case we'd probably be glad of them.