In reply to pete82:
I wouldn't go to Wyndcliffe, routes are 150 ft or so.
Wyndcliffe Quarry is shorter and roadside, but too hard for little ones, and the holds are way too far apart.
At Symonds Yat there's an area around "Plopalot" and "Tarzan's Nuts" that's got a number of short (20 to 30 ft) Diff to V Diff routes with holds close together, plus the obligatory great big trees at the top to arrange a sling around for top/bottom roping.
Whatever you do though, DON'T go to the Introductory Rocks, they're so shiny you can almost use them as a mirror for shaving.