A campaign is being launched to raise awareness of the crippling impact of toilet phobia.
The National Phobics Society estimates at least four million Britons are affected - but the true number could be many more.
Toilet phobia can simply be manifest as a mild distaste for public loos. But some people develop such an intense obsession that they are left housebound, and may refuse to undergo potentially life-saving medical examinations.
The first piece of advice I would give to such people: at all costs, avoid holidaying in France.