Habitation Door Lock, ex British Leyland

The ex B-L door lock mechanism on my 2004 Clubman's habitation door is showing signs of wear. It is loose and floppy! Does anyone know of a source of these? Or is there a spare out there somewhere? I have an extra security lock over the door but it would be nice to replace the door lock. Thank you.

Obviously  Ebay,  Search for handles from Allegro, Marina, TR7, early Discovery. Just make sure its the right 'hand" (opens left or right hinged).