This coming weekend, I have a moderate layover in Heathrow airport. As long as there's no big delays, I should have a few hours spare.
At the same time, I've realised there's some papers I need for my destination, which are currently at our head office in the UK. The cost of posting them to where I'm going is rather high, and if sent where I am now they won't arrive in time.
There isn't enough time to get to the office and back, so that's out, and I can't see anyone from work wanting to trek to the wrong side of London to drop them off to me in Heathrow in person!
That leads me to wonder - is there a post office in / near Heathrow airport, which offers Poste restante, and is open on Saturdays?
(If there is, then that ought to allow work to post the papers to said post office, and I can then enter the UK, head to the post office, collect them, then return through security for my onward flight. It'd work out a lot cheaper than the other options I can think of)