Colin Hanks, of Deanwood Close, ran the Eastbourne half marathon in one hour and 50 minutes and is donning his running shoes in the capital on April 13.
The 40-year-old is hoping to raise money for those affected by the UK's most common, life threatening inherited disease that claims three young lives a week in the UK.
Colin, who has not run a full marathon before, said, "This will be a real challenge for me but the knowledge I will be raising funds to help see off cystic fibrosis will really spur me on to the finish line.
"Then I will be able to have my first pint of lager since January."
To sponsor Colin visit the website at www.justgiving.com/colinhanks
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