Ah, #402. Just noted it down as being sold in the 'Cars For Sale' thread on Friday, after it was de-listed from Auto Trader. I don't think it is a (ex-) Two-Sixties member car, but I could be wrong.
Suspension has only a very few similarities with the 190. In essence both front and rear ends are unique to the 260s.
You should try to get a RAVE CD from an Xpart dealer if you intend doing any work on the car.
At present this is being advertised, a very rare genuine Workshop Manual - Service Procedures CD. It is similar to the RAVE CD, but may not be quite as up to date: https://www.ebay.co.uk/itm/MG-ZT-260...EAAOSw535gdvXV