Adrian,
I might be able to use these, but it's a bit of a long shot - I'm running a client event on that Tuesday and Wednesday at Heathrow, and will probably stay over that night before heading back to Manchester (and not in a rush to get back), so could use these.
Trouble is, I don't know yet if I'll be flying or driving back....
. Is that any good, or too vague to be of any use to you?
Stephen