Specialist advice about cancer is now available at a so-called "pop-up" clinic, which has opened in a shopping centre in Croydon.
It is a temporary store to encourage people to ask for help if they think they have got cancer and It will make it easier to get checked out.
This could improve their chances of survival if they have the disease. Piers Hopkirk went for a look around.
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The retrospective is so in-demand the museum will open its doors all through the night for the first time since it opened in 1857.