We're in the habit of parking at Heathrow when we need to go into central London. Before we get on the tube we often pop into one of the terminals, usually T5, to pick up some lunch, use the loo etc (DH has prostate problems)
Apparently at the moment you can't enter the terminal unless you're actually flying. Does anyone know if this is enforced....I saw that documentary the other day on TV and it didn't look like there were any staff on the doors.