Thanks guys, this is all really useful information!
I have downloaded copies of the training manual and will work through them.
The closest fields to me (both towered) are Red Hill and Biggin Hill, to give you an idea of where I am. I am prepared to travel if needs be ( I will have to do some anyway. I would also consider relocating).
I will look into the A/G certificate of competency as well.
Again, thanks everyone!
Craigyd