Thanks all for your help. I know that there is little benefit in knowing all the ins and outs of the exact elements of lift, however it is just to satisfy my curiosity. I was one of those kids who was always wanting to know 'Why'. I've always had a need to know how things work and was getting frustrated by not knowing all about Bernoulli's principle.
I shall go away and have a look at the different theories linked to on here and will come back if I have any other questions.