They do have a very good name as far as I have heard; very knowledgeable about 'our cars' too.
No personal experience of them or the car currently advertised though.
This thread may help you too: Forum / Public Section / Cars for sale / Complete List of 260s FOR SALE
From that list, https://www.two-sixties.co.uk/mgoc26...FOR-SALE/page3 , post #36 may be of interest? Again no personal knowledge of the car or the owner/history at all, simply a possible pointer !
... when you do find one, don't forget to come back and join as a full member
David