For three Monmouthshire men, finishing the London Marathon wasn't just the end of 26.2 miles, but part of a round-the-world trip which has already taken in the world's top ten marathons.
Mark Williamson and Andy Booth started running marathons 10 years ago, and have raised money for various charities including Macmillan Cancer Support.
The friends have raised close to £1million and, having been joined by Mark's son Andrew, are determined to reach the landmark figure.