In message , Neil Williams
writes

It is notable that, in the Netherlands, most establishments have a
sign up stating that the toilets are available to the public on
payment of EUR 0.50. This contrasts somewhat to the UK when they are
normally signed as being for customers only.

There are, though, an increasing number of councils that have a
"Community Toilet Scheme" under which members of the public can use the
facilities in local shops and pubs without making a purchase - Richmond
was the first and others in London include Waltham Forest and a limited
pilot scheme in Camden (Kentish Town).

Here in Richmond, which now has such an arrangement in more than 60
shops, cafés and pubs, the owners of premises participating in the
scheme get a fee of about £600 per year, plus stickers to put on the
window, and report that, far from being a nuisance, it tends to bring in
more passing trade (as it were)
--
Paul Terry