He's got form, sarge

A quick Googling reveals that jason hatch, the Buckingham Palace Batman, has been up on a building before and was also involved in chaining up court buildings.

Yet apparently, he was able to get into Buckingham Palace when "He legged it past the armed guards" which makes you wonder just what might happen if one of these terrorists we hear so much about decided to do something similar. Very little, it would seem.