[Shasown]

Security Service(MI5) need to be on the ball 100% all of the time. Terrorists only need to get lucky once.

Interesting point to note is that last time there was talks of government departments coming under large budget cuts, stories were circulated about 200-300 trained terrorists already acting in sleeper roles in the UK.

No coincidence the fact that government departments are once again facing budgets cuts and somene high in the intelligence community mentions 'ongoing surveillances operations' to the press.