Chris,
Ive checked it on the route finder for you its only about 30mins away. I'll post the link for you with the directions.
Route Planner (GB) : Maps and directions - The AA
You cant miss it when you get there, the name is in big green lettering and there are snake and spider desighs on the window.
The shop is open from 10am-5pm everyday except Sunday when it closes at 4pm and its closed all day on thursday.
Hope this helps