Originally Posted by stut
APD has indeed got higher rate for premium cabins (as an aside, as these were defined as being separate cabins on an aircraft, Concorde counted as 'economy' for the purposes of this duty). Whenever I've been upgraded, though, the cost has been borne by the airline.
Same with re-routing to higher-tax airports (e.g. LCY).
So people flying Concorde avoided Tax

/

- not sure whether I find that funny or maddening - The exremely rich will always find ways of avoiding to pay their taxes!