Many travel guide books on London will tell you that if you are a tourist walking through the UK's capital, there is something sorely lacking.
The number of public toilets in the city has fallen 40% since 1999.
The mayor of London, Boris Johnson, has launched a new scheme to change that.
His plan is to get willing businesses to put stickers on their windows to let people know they are welcome to come in and use the facilities.
World Update's Robyn Bresnahan went out on the streets of London to ask people what they thought of the city's public toilets.
Will the mayor's new scheme work?
Robyn spoke to Jo-Anne Bichard, a research fellow at the Royal College of Art in London, who specialises in the design and placement of public toilets.
After chatting to Jo-Anne, Robyn visited one of London's existing public conveniences.
First broadcast 20 March 2009