In reply to gavjwp:
assuming you mean a buggy that the child sits in
we've got one of these which my wife really likes
http://www.babyjogger.co.uk/summitX3.php
routes?
monsal trail, manifold way, around the derwent reservoirs, tissington trail, high peak trail, canal towpaths, quiet lanes anywhere, maybe up and down burbage valley - if you can get through the gates at the top/bottom. there are probably more out and back routes than circuits but no shortage, enjoy!