London 2 Brighton Challenge

100 km from Richmond-upon-Thames to Brighton Racecourse over a late-May weekend (May 29 and 30, 2027), following the Thames before crossing the North Downs and finishing over the South Downs. That second line of downs comes late, so build hill repeats on tired legs into your training rather than only flat distance. Rest stops come roughly every 12.5 km, with bigger ones about every 25 km, and at walking pace the full distance runs through the night on a route marked with glow sticks. A first-timer can pick a 25 km, half or 75 km option, or spread the 100 km over two days. You can self-fund with no fundraising minimum or take a charity place with a reduced fee and a sponsorship target, a choice worth making deliberately.