The police (un armed) apparently arrived in 9 mins, The Armed Response Unit was a few minutes behind. As all who live in the UK must be aware cops don't carry guns routinely, thus when armed incident occurs they are not just down the street.

And remember cops are just like the guys who post here, they don't have super powers, although they choose to put themselves in harms way to protect the public. An unarmed officer against a guy with a gun cannot do much to help anyone.

( I am surprised this post has taken so long to criticise the police, but now the usual suspect are crawling out of the woodwork with their penny's worth).