I assume you've looked here, Phil :
Complete List of 260s FOR SALE
OK, "Complete" I can't guarantee, but I check the status of those listed every day as far as possible, and take a look at all the known "watering holes" for new ones coming up for sale ... so pretty complete?
About 30% are LHD or RHD but non-UK listings, and a few are Rover 75 V8's not ZT260's, but that should be clear.
(If you do find others or find any listing shown to be inaccurate / no longer available, please PM me. Thanks).
Best of luck!
David