This doesn't seem to be an unreasonable concern, given [1] Bakri's recent calls to jihad. From [2] The Guardian, with thanks to all who sent this in:

Police chiefs in London are "terrified" that terrorists will target a packed nightclub in a Bali-style bombing, it is reported today.

West End theatres and multiplex cinemas could also be targets, they believe.

Scotland Yard is so concerned that a popular entertainment venue may be the scene of an atrocity carried out by al-Qaida followers that it has set up a team to gather intelligence.

Officers have been sent to pubs and clubs throughout the capital to advise staff to watch out for people acting suspiciously.