First of all, the usual excuses if this particular has already been addressed on this forum, but I couldn't find it.

Just read this blog http://viewfromthewing.boardingarea.com/2016/02/26/refund-uk-apd-luxury-departure-tax/

This guy clams that UA is refunding APD charged if you send them a BP for a flight out of the UK occurring less than 24 hours from arriving. This is of course a situation where you'd have a separate ticket on a different airline.

Anyone knows of something like this happening on BA?