Once: Win flights to London for you and a mate from STA Travel
To enter you need to like them on Facebook. You need to link your basic info on FB to enter (which is at least basic and not the whole schmozzle like some others) and then you need to enter your name, email etc later.
You dont need to allow them to be able to post to your wall etc to enter the comp - just skip that step. You do need to sign up to receive their newsletter though.
Winner gets two return flights (cattle class) from the nearest capital city to London. Nothing else is provided.