None on the airport site that I could find.
Robert mentioned there’s at least a dropbox in between M&S and “Shop and Collect”, near domestic arrivals.
Based on the terminal map, it’s pre-security, maybe by the Luggage Collect? The M&S is the only one listed in the airport, so head there and start looking.
Robert also emailed to say there may be one on the second floor (that is the first floor for British people). It’s at the top of the escalator, across from WHSmith store. (Note: WHSmith may also sell stamps, so they may also know where the box is.)
Note that the postbox may be red because it’s Royal Mail, not the blue of USPS.
Last Updated 22 November 2021