Brent has lost nearly three-quarters of its public loos

The British Toilet Association (BTA) will paint a closed toilet in Harlesden, add a baby changing facility and replace fixtures and fittings.

One third of all public toilets are closing in big cities, which the BTA says is creating a crisis in "street hygiene".

The group are desperate to reverse the trend and hope to show on Friday how a "grotty loo can be turned into a public pride of place".

Richard Chisnell, director of BTA, said: "This is a serious issue that will have an increasing effect on our tourist trade and our national pride

"Local residents can bring about real change by persuading their Local Authority to provide more and better public toilets - available all hours."

The BTA is being supported in its transformation by a number of commercial companies along with Brent Council, which has seen its number of public toilets fall from 23 to six.