My understanding is that if you morris is over 3500kg laden weight or (gross vehicle weight) and built before 1st Jan 1960 then it would be MOT excempt.
This is from the back page of the V112G
no 30. Motor vehicles first used before 1st January 1960, used unladen and not
drawing a laden trailer, and trailers manufactured before 1st January 1960
and used unladen.
For the purposes of this paragraph any determination as to when a motor
vehicle is first used shall be made as provided in regulation 3(3) of the
Construction and Use Regulations. Motor vehicles constructed, and not
merely adapted, for the purpose.
What is the gross vehicle weight of a Morris C8 ?