North east of Brighton near Falmer village there is a steep climb at Housedean Farm. This is on the South Downs Way in the South Downs National Park in England. This video is of me cycling up the hill on my mountain bike. You will need low gears for this hill or will be hike a bike at stages.
https://en.wikipedia.org/wiki/South_Downs_National_Park
info on housedean farm
https://www.housedean.co.uk/