I've just signed up for the SDW100 from Centurion running on 30th June this summer.
I must admit I absolutely love getting out on the downs and have run 10 marathons across most of it now. 13,000ft of ascent, ending at the top of Beachy Head with 15 aid stations along the way.
Pacers are permitted after 53 miles
Having done the Ridgeway 85 as my longest event......then breaking my leg, I am ultra-keen to crack on and run a 100!