In reply to DD72:
Kerlouan in Brittany is ace - very quiet, cracking beaches, not too hot (normally always a coastal breeze), great place for biking/surfing/other water based sports - went for two weeks and saw no other climbers/boulderers there (late June just before French holidays though). Plenty of camping spots, some lovely boulders (some on beaches, some not, some with great soft landings others not so). Also very kid friendly due to quietness and nr of beaches.
And there is always Glen Nevis - plenty of climbing/bouldering, campsite, child friendly and you can def drive to it