I usually paint out the registration but I decided not to this time; not sure why - I think just to make it look just like an ordinary British Mini... That'll teach me.
No idea what the "M-Type" means but it's what they seem to call it wherever it's pictured.
I think the other MG Mini Lavrakas is referring to is the ADO34 MG prototype. It still exists and I believe was sold at an auction a couple of years ago. Strangely it hasn't been puzzled here, which is why I haven't included a picture of it now.