HI Griffo,
I'm sure the Taj Mahal is at Agra.
Jefford's book 'RAF Squadrons' has maps showing every airfield ever used by the RAF and it shows one at Agra which was apparently used by 20,30 and 114 Squadrons.
My copy of the history of 30 ( Flat Out ) has several photos of the airfield - none show the Taj Mahal unfortunately.
Brian