My own ZT-T 180+ auto has 41k and is currently insured for £4000. Mine is standard, tidy, not full of dents, belts done, running on matching Michelins, not rusty underneath etc. I might look to get the insurance value increased slightly at renewal.
Condition, spec and history is important. If it's fairly nice, it sounds about ballpark right but there's not much to go on.
ZTs and ZT tourers are rarer than Rover equivalents. According to my MG Rover production data, there were 469 ZT-T 180+ made.
Were I advertising such a vehicle for sale, my personal preference would be to use Car and Classic and Fleabay and avoid FB. And head off lots of people asking about when the belts were done (actually a £450 job by professionals) by putting the date and mileage done in any advert. Lots of details and information plus good photots will help. Good luck.
