LASORS section F3.2
An applicant for a class rating for a single-pilot MEP
(Land) aeroplane rating must produce evidence of having
completed a minimum of 70 hours as pilot-in-command
of aeroplanes.
The actual MEP training is 6 hours (minimum) all-dual, so if you're not already very close to the 70 hours PIC when you start the course it might be good to wait a bit until you are.