Another local one for you:
http://www.phoenixtrainingonline.co.uk/

I did my DAS from Amesbury and took the test in Salisbury.

Got on very well with the team there and passed first time.

What I liked a lot was that they spent a lot of time in and around the test centre (that you start / finish from) and the test routes.

They will look after you well.

Good Luck.

gerry