http://www.technobotsonline.com/saberto ... ersal.html

This is the 25A controller you want. You will blow the 10A one running drill motors (I know because I have). If you run with 12v drills on 12v then the 25A controller will do the job fine. You should be able to get them from dimension engineerings website.

Ok now lets talk consultancy fees, for the above info I'd say 100 quid is about right