All new, or substantially refurbished, non-domestic buildings which are accessible by the public, are required to provide washroom facilities which can be used by everybody, adults and children, whether they have special needs or not.
There is a requirement for all new building work to comply with Approved Document M of The Building Regulations, The Disability Discrimination Act, and BS8300
DISABILITY DISCRIMINATION ACT : 2005
The Disability Discrimination Act 2005 requires ‘that all suppliers of services, goods and facilities to the general public must remove all physical barriers where deemed reasonable’.
So where toilet facilities are offered reasonable provision for everyone, of all levels of ability including wheelchair users, must be made.