"¡El gato es delicioso!" "¡Qué cretino!"

These are the waiter's answers you didn't vote for:
'I know a good language teacher' and 'Don't worry, it's a common mistake.'.

Anyway, I was in Golders Green yesterday evening and went to the tube station only to find it crawling with police. Is this common at rush hour now? I can't find anything on the BBC News about an incident or threat of one at GG for last night...