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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Jessica Urbano Ramirez was one of the 72 people who died as a result of the fire on June 14 last year.
A quadruple stabbing and a shooting that happened less than a mile from each other on consecutive days are believed to be linked.
The machines were bought by Mr Johnson from Germany in 2014 - before their use had been licensed on the UK mainland.