The IoFs chief executive, Peter Lewis, has insisted that 'chugging' still has a future.
He said that last year 865,000 donors signed up to long term donations after being approached on the street, raising £130 million a year for charities.
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The Olympian was one of several sports stars who opened up to the prince during an event for his mental health charity Heads Together.
There will be sunny spells, with temperatures peaking at 23 Celsius (73F). However, Northern Ireland will experience frequent showers.
Scottish X-Men star Alan Cumming under fire for 'offensive' comments blaming Brexit vote on 'stupid English people'.