Jason, Mick and Olly are doing the somewhat misleadingly named La Petite Trotte à Léon – all 300km and 27000m climb. Even the organisers call it an enlarged Tour du Mont Blanc.
Update
24 hours in and it looks like team ‘Carnethy Hill Runners’ are doing fantastically, sitting in 6th place in the “La Petite Trotte à Léon”. This is around a third of the way round the 294k/28,000m event and it looks like they are taking a bit of a rest at the second of 5 ‘Life Bases’.