I would echo the 'don't need to be a graduate, but need to be clever enough to be one...' I have a friend who is a pilot for BA - he was one of the last on their cadetship scheme. He went straight from school - but only because he was clearly intelligent and had excellent A levels including Maths and Physics, as you mention.
Incidentally LASORS is free to download from
www.caa.co.uk as a PDF. It's a nasty website to navigate but if you use the search function (top right) and enter LASORS, the correct link comes up as the first hit.
Oh, and good luck. Are you an air cadet, by the way (CCF if your school has one, or the local Air Training Corps)? If not, it would be worth thinking about - you don't have to go the military way afterwards but you will learn a lot about aviation and also a lot of self-discipline on the way.
Tim