Noted. I've only just re-entered the market so in the research stage. A good delve into sold results on Bring a Trailer as a home market litmus test suggests that mid-miles 6 speeds can sell for between $15-$20k, give or take, a little more for super low milers
For example:
Bid for the chance to own a No Reserve: 1999 Chevrolet Corvette Coupe 6-Speed at auction with Bring a Trailer, the home of the best vintage and classic cars online. Lot #128,017.
bringatrailer.com
Bid for the chance to own a No Reserve: 2000 Chevrolet Corvette Convertible 6-Speed at auction with Bring a Trailer, the home of the best vintage and classic cars online. Lot #122,545.
bringatrailer.com
So if we said $17,500 plus all the charges and fees, RoRo, US and UK shipping, taxes, duty etc, etc would work out about £20k in my garage, which would be toward the upper end of where I'd want to be.