Think the local public swimming pool here in Long Eaton works well with minors in public changing room environment.

Family room can be used by parents / responsible guardians accompanying minors up to the age of SEVEN. After this age, the minor MUST use the separate Sex changing rooms, and with a same sex parent / responsible guardian up to the age of 14... NO EXCEPTIONS!!! This also applies to disabled users, as all changing rooms comply with the Disability Discrimination Act in the UK.

Simple rules like this I can live well with :)