Yeah they are a pain in the ass to find. The Mayflower theatre is the side you need to be on but then follow signs to train station which is a left turn at the traffic lights. You will then have the train station directly in front of you, then take a right at the T junction and you will drive past the taxi ranks and go under a bridge into small industrial units. They are up there on the right hand side ( watch out for speeds bumps as I found out the hard way)