My advice when doing the PPL would be to do it in the cheapest aircraft possible - usually a 152. By learning in a PA28 (yuck, by the way) all you're doing is jacking up the hourly rate to the extent that you'll probably pay at least another £500 over the course of the, err, course.
It's very quick and easy to get a checkout on another type once you've got your ticket. Note that this isn't a legal requirement, just clubs/schools protecting their aircraft. An SEP is an SEP is an SEP, after all (unless it's got a wobbly prop and disappearing wheels).