Make sure you look at the directions on the site though as its not visible from the main road. Probably quite easy to ride past. Nice big car park when you get in there ..... when I was there Sat there was a burger/tea van there too.
If you go on your own Mr_S, it's easy... end of the M275, round the roundabout to come back the opposite way but stay in left lane and take the first left by the printers shop. To the end of the road and turn left (or you'll get arrested for breaking into the ship yard!), and you'll see the shop after a short way on the left. Think I've got that right!
I think the web site is being built quite slowly but changing on a daily basis. Definitely not an indication of how good the clothing section is though .... much better when you get in there.