Hi Roger. Yes sorry it is a Slough built Lt15.
It seems as thought the 471 you mentioned is your standard ‘Morris Minor’ whereas the L549 is the one listed in TOC spares catalogue. I guess either is acceptable unless it was specified. Unfortunately there is a distinct lack of technical information on Slough built cars. I cannot understand why they never produced a workshop manual for these cars.
Thanks for the advice.
Best regards
Paul