As said above, planning permission for the lans if you pan to keep the cars in large grounds.

Paul at North Yorks Spares does well, and i being from Scotland would be interested.

Maybe worth speaking to him?

But i wouldn't leave it to only fords, you could try and specialise in the RS / ST models, but you wouldn't survive on fords alone i don't think.

I think it can be a very lucrative, but very competitive market.