Friends were going out LHR + BA to Spain today. They were dropped off at T5, and their mum got back on the M25. At the check-in they discovered they had not looked closely enough and the flight was from T3....
She returned, so that was another £5 and then took them to T3 and that was another £5. = Ouch. They said everyone helpful (they have a one year old baby) and place not too crowded.