Many accessible toilets are kept locked, so rather than have to wait for a member of staff to unlock the door for you, the the Radar national key scheme means you can access any 'Radar toilet' in the UK with one key.
You can buy a list of Radar toilets alongside your key from Disability Rights UK. Details of local accessible toilets can be found on the Portsmouth City Council website.
Radar keys cost around £3 - £5 and can be purchased online from the Disability Rights UK website, via mail order by contacting Disability Rights UK, or at the following vendors: Visitor Information Centre - D-Day Museum, Paulsgrove Housing Office, Enable Ability - Copnor Road, Frank Sorrell Centre - Prince Albert Rd
(Information checked April 2016)
No need for a referral, but you may be asked for proof of need.