Thanks for replies
I've been in touch with business gateway and thought I'd let you know how I got on....
The advisor was lovely, very positive and encouraging, loved the idea and thought it'd work - however she couldn't give me any advice because she didn't know anything about planning rules or if I would need to get change of use on one of our buildings!
Although the encouragement & positivity was great, I came out feeling very confident until I realised I didn't go in there for a confidence boost!
Back to the drawing board.
I've done a bit of digging on google and found some info I'll just keep looking for now