Just a tip that Nick at Austin Garages has started selling the 6 special rear-subframe bolts as a kit for £25.
https://www.ebay.co.uk/itm/MG-ZT-260...4AAOSwFb5aD4Ix
A glance at other 260 stuff he has available is a good idea I think, since sometimes things can creep in unnoticed!
https://www.ebay.co.uk/sch/austingar...p2047675.l2562
David