Mr R wrote:

How stupid
http://news.bbc.co.uk/1/hi/england/london/6213559.stm

I agree - does the Underground have no security whatsoever?!

It must have taken HOURS to do that amount of damage. And, not one
single staff member on patrol throughout that time? It beggars belief.

Returning to a neighbouring thread, I see that the Underground has had
to abandon its ban on photography of vandalism!

Marc.