Many thanks to both. Guess I will need to use the tips from ThaiVisa forum on how to avoid the queues then
Then I will only have to battle the secret cigarette police, the taxi touts and the "meter no working" taxi drivers
Its QR612, it gets in at 0650 so from what I can read it should "hopefully" miss the worst of the queues.
Ive already been reminded to ask for the Fastrack card on the plane on my return to LGW which I had forgotten about. Not registered on IRIS, theyre never open any time Ive been through there or LHR.