I'm flying F tomorrow morning and will be in the CCR between around 0700-1030. I've a very important letter I need to print off and post, but won't be able to get hold of an envelope or a first class stamp before the airport.

Does the CCR have a posting facility?

If not, I assume this is a WH Smith and postbox job. Where are the airside post boxes in T5?

Thanks for any and all advice.