I read on the Crendon site your car uses Jag XJ brakes/suspension.
IF your suspension is 04 and On it's M12 X 1.5 and I'd recommend using The Peg bolts from Backdraft racing in the 35.5mm length. These are smaller dia and lower profile in head height. Your wheel would need to be indexed 45deg and redrilled to the new dia.
https://www.iconicparts.com/peg-drive-bolts.html
IF your suspension is 63-03 it uses 1/2"-20 studs and Backdraft Pegs won't work.
You could also use the Backdraft hub Adapters as they are thinner than the Trigos but also will have to drilled to 5x120.7mm pattern (XJ 63-03) or 5x108mm pattern (XJ 04 and On)
(Backdrafts use BMW 5x120mm patterns)
https://www.iconicparts.com/peg-drive.html
In that case I'd contact Image Wheels in Tipton (120 miles N of you). I'm pretty sure they can come up with a work-around.
Bolt on Centre Lock Adaptors - Image Wheels