Go for it Paul ! Good luck.
As an ex Surveyor - General Practice - dealing with the valuation of shops I would say there are three things to consider. Location, location and location
As an ex - cyclist, soon to be a re-born cyclist, I would say a smile and great cakes are the next best things. The smile is free but you need to make the cakes if you can.
Pyle Garden Centre is a great model interior, stuff in some retro bikes and transfer the operation to, say, Pencoed main street or St Brides Major (fewer pedestrians more cyclists en-route - and will they stop ?) should do the trick.
Get your pinny out
Tim