Dominic Kavanagh is a Clinical Care Patient Advisor for the Midlands at the Cystic Fibrosis Trust.
Many people from the region are running the London marathon to raise money for the charity, but he says he's confident in the country's security services.
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It will be hot with sunny spells today and feeling humid. Thundery showers are possible later.
Expected to be largely fine and hot but with isolated thunderstorms
Health professionals are advising people to take extra care in hot weather.