Well, Santa duly arrived and as hoped bought a trimmed centre console from Richard at Banks Engineering. After looking at it sitting in the spare bedroom since Christmas day, I finally got around to fitting it this week, and it looks great.
Whoever does Richard's trim work is first class, it's exceptionally neat and there's no way I could ever hope to reach the same standards. For anyone else curious about such things, this is a heavyweight reproduction fibreglass console which looks to have been molded from an original ABS one and has been trimmed in black vinyl (looks grey in the photo, but it's black). There are no holes drilled but there are indications on the ashtray where to drill. The cut-outs for the window switches just needed the vinyl cutting back, otherwise it's all ready to go.
It's a reassuringly tight fit and I had to cut out some of the insulation from under the carpet as this doesn't flex as easily as the originals, but hopefully it won't crack as easily as the ABS one did !
Brian