Britain's "complex and difficult" military action in Syria "is going to take time" and will require patience and persistence, Prime Minister David Cameron has said.
Mr Cameron said: "There was a compelling case for extending our airstrikes from Iraq to Syria and I was glad to see such strong support right across Parliament actually from members of six different political parties voting in favour of this necessary action."
But he warned that the UK needed to be "patient and persistent" and that the action would "take time".
The shadow chancellor warned it could foster another generation of militants determined to commit a Paris-style terror attack.
The Defence Secretary has warned the RAF that the fight against Islamic State will not be short or simple.
Officers were posted outside the constituency office of Neil Coyle, the Labour MP for Bermondsey & Old Southwark.