Jeff Stockwell, 62 and from Broomfield, will take part in the walk from London to Brighton this July alongside his son Tony, 40, and grandson Aron, 21.
He says: “This is actually my third attempt at completing the 100K, so fingers crossed it’s third time lucky. I’ve been training hard but if worst comes to worst my grandson says he’ll push me to the finish line in a wheelbarrow.”