In reply to Kevster:
Yep, lower Dorset grades are a mixed bunch, especially on lead, and yes, of course the lower grades are polished, that's pretty normal., but as I said, if you have a stronger climber, all of those places I mentioned have easier grades and setting up a top rope should be trivial.
Lots of low grade fun to be had in Portland/Swanage
I'm a terrible sport climber, 6a at best, much prefer trad, but n the occasions i've been taking people outside for the first time, these are the places I've picked as the routes are short, not very exposed and generally have an amenable approach.