In reply to hjwindsor:
That's a coincidence: I grew up in Grayshott, just up the road from you.
In addition to the recommended walls that people have suggested (e.g. Craggy, Purbrook etc..), I would also take alexanderjwatt's advice on board regarding a fingerboard in the garage. This, alongside some sort of basic TRX setup and a pull up bar, will give you access to finger + full body conditioning.
If you don't know how to use a fingerboard already, read up on it and take it steady. They have the potential to be the best and worst thing for you (i.e. really strong or really injured).
p.s. here's a link to the TRX setup I've got, there are cheaper ones available, but this one seemed good quality (and I liked the name...):
http://www.henchgripz.com/index.php?main_page=product_info&cPath=107&am...