Again, just to repeat the point, don't fork out for an aviation medical before you've had your mind put at ease by your GP. I found it bad enough sitting the waiting room knowing I was ok.
As for Headcorn, I have no knowledge of the training set up onsite but I'm very fond of the airfield. I did most of my circuit work at Headcorn as it works out far more affordable than doing it at my home Airport, Southend.
Best thing to do is pop down there for a chat as that way you get a feel for the place and its set up.
As for general tips and advise, don't pay large amounts up front and don't get too fixated on headline prices, as unless you are an incredibly gifted natural born flyer, it is more than likely to take over 45hours, especially if you're only having weekly lessons. Also worth bearing in mind is although the pricing is spoken about as hourly lessons, once you get further into the training it's pretty rare to have just an hour.
Now go sort out that GP visit.
