Stigma, fear and complacency are the greatest obstacles to people seeking out their HIV status.
This is why Terrence Higgins Trust and the Mayor of London have taken this initiative to encourag those most at risk to take the HIV test.
Knowing your status can literally be a life saving action.
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By law, the Met Police has a duty to police public land outside grounds - that's costing them £9.3m a season.
John, who began running for Age UK back in the 1980s when he was aged 53, has raised an incredible amount since then - more than £40,000.