Prostate cancer will become the most common cancer in the UK "in the next 15-20 years".
"All the statistics say that prostate cancer is currently the most common cancer among men, it's about as common as breast cancer. Within the next 15-20 years it will be the most common cancer in this country.
"For the majority of the men who have it, they don't have any symptoms. That is the very reason why you need to go to the doctor, particularly when you get close to 50 and see if the test is right for you."
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Mayor of London Sadiq Khan is backing the scheme.
Sunday will be a fine day across much of Scotland and northern England, with much less coastal mist and low cloud than yesterday.
A spokesperson said the lightning strikes had left the "aircraft fuelling system unavailable."