As others have said, good to see another Scot on here.
I bought my Z from MacKays, and I was very happy with the service, price etc. If they are still doing the same deal, you get it cheaper if you pay a deposit before it arrives in the UK. I waited until I saw it and drove a couple before committing, and was happy to pay that bit extra for peace of mind.
They do the full conversion, Bimta certificate and so on.
My insurance is no more expensive than for a UK spec car.