Thanks a lot for your help. I needed a bit more of a layman's explanation, but I found http://web.mit.edu/2.972/www/reports/airfoil/airfoil.html" that cleared everything up (and what you said made suddenly so much more sense, because I hadn't fully understood circulation before).
Finally! No...
I've just finished the practical part of an investigation into lift and angle of attack. I also took airspeed readings over the top and bottom of the wing at the leading and trailing edges.
What I'm having trouble with is grasping how lift is generated. I understand the underlying principles...