DragStrut - I hope it works out! I took my medical very recently and I too have a few concerns about the lung tests... I dive and have done for years, have kept fit and healthy and never smoked BUT failed to get a 'great' result in the lung function tests. My question is (sorry if it is a selfish one) did you find out you'd failed on the day while at the CAA?
I am awaiting my letter and trying to weigh up if my results were not good enough and if they would have told me on the day. Surely they would!
The worry I have had since deciding to go for a career as a pilot is enormous! I am sure it's all worth it! Good luck to all those going to a medical at Gatwick. It is really not a bad experience and not something to be nervous about. However... my tip... when you get to the lung funtion test... do it like your life depends on it!!