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