Help Turkey close it's borders to ISIS volunteers
Stop the supply of arms to ISIS
Help cut the funding that ISIS are getting
Support moderates in the area.

Bombing has been a proven failure which cannot target the right people and only creates more radicalisation where it has happened.

All that being said, I think a free vote for all parties, where the individual MPs can vote with their conscience rather that their party, is the right way to go in the circumstances.