05 oxfordshire dorchester on thames

■ Distance: 9 miles/14.5km ■ Time: 3½ hours ■ Grade: Moderate

■ Distance: 6½ miles/10.5km ■ Time: 2½ hours ■ Grade: Moderate

Roger Butler peers over steep slopes on a roller coaster along Offa’s Dyke

■ Distance: 6 miles/9.5km ■ Time: 3 hours ■ Grade: Easy

■ Distance: 5¼ miles/8.5km ■ Time: 2½ hours ■ Grade: Moderate

■ Distance: 6½ miles/10.6km ■ Time: 2½ hours ■ Grade: Moderate