Curfew for 11 yr old?

[dameofdilemma]

Just wondered what time you expect your 11 yr old to be home?
Dd is allowed to go to the high street for the cinema, shops, cafes etc with her friends, on weekends. I've proposed a 6pm curfew (as she's out and about rather than at a friend's house or within earshot).

Does that sound reasonable? It's London (not that that makes a difference necessarily).
She's pretty sensible generally.

My 11 yos aren’tout enough to have a set curfew. Timings are arranged depending on the plan - where they are going and what they’re doing. No point saying 6pm if the film ends at. 6.15pm but if they’ve been at the river all afternoon a 6pm home for dinner is reasonable.