In reply to chris_r:
On Wirral, you could look at Irby Quarry - ideal for kids top-roping in the Diff-Severe range
https://www.ukclimbing.com/logbook/crags/irby_quarry-1111/
There's also a little outcrop next to the Cenotaph above West Kirby (near the Grange Hill crag detailed in the Cheshire and Merseyside guide, p215, which is only about 6 metres high but offers 3 or 4 lines you can top rope around Severe to VS.
The logbook entry for Grange Hill has a couple of photos of the separate wall next to the cenotaph (which is a few hundred metres away from the actual Grange Hill wall):
https://www.ukclimbing.com/logbook/crags/grange_hill-8849/
I took my daughter to both of these during Covid when she was 5-6ish and she enjoyed them for an hour or two.
Otherwise, yes Trevor Quarry is probably the friendliest Clwyd spot for top-roping but it doesn't go as easy as Diffs I don't think.