I must say I thought all public toilets were shut. According to Bournemouth council though, the following ten toilets are open from 10:30 AM to 5PM on Bournemouth seafront:
https://www.bcpcouncil.gov.uk/News/News-Features/COVID19/Changes-to-Services/Services/Toilets.aspx
* Alum Chine, next to the playpark
* Boscombe East, just past the coloured beach huts
* Boscombe Overstrand, next to Urban Reef restaurant
* Bournemouth East, next to Harry Ramsden’s Fish & Chip shop
* Bournemouth West, between Happyland Amusements and West Beach restaurant
* Durley Chine, 100 metres east of the Durley Inn Harvester restaurant
* Fisherman’s Walk, 100m to the west of Fisherman’s Walk Cliff Lift and zig zag
* Portman Ravine, 400 metres east of Bournemouth Beach Lodges
* Southbourne, near Bistro on the Beach
* The Prom Diner, 200 metres west of Boscombe Pier
Whether people used them is another matter.