DOH-LHR BA (operated by QR): transit (as less than 24 hours in London)
Originally Posted by
DY444
Flying out of the UK usually attracts a premium so trying an alternative to that might be a start.
Not that simple.
Departures from most, but not all, UK airports has the UK APD --
https://en.wikipedia.org/wiki/Air_Passenger_Duty
For UK transits (<24hrs) APD is
not charged.