Although it’s not an airport, Victoria rail station in London has a good range of eating places.
When I was in London for a few days back in May I ate there. At Spud-U-Like it cost me two pounds 93 for a jacket potato and a drink (not bad considering it was a station outlet in London).
Sorry for writing the amount like that, but I’m not on my home computer, and this one I’m on is a pile of s**t, none of the keys have the proper symbols and it doesn’t have a pound sign!!:mad: