07 hertfordshire london colney

■ Distance: 6 miles/10km ■ Time: 3 hours ■ Grade: Moderate

■Distance: 7 miles/11.4km ■Time: 3 hours ■Grade: Moderate ...

■ Distance: 7½ miles/12.1km ■ Time: 3 hours ■ Grade: Moderate

■ Distance: 7 miles/11.2km ■ Time: ...

■ Distance: 8½ miles/13.7km ■ Time: 4 hours ■ Grade: Moderate

■ Distance: 7¼ miles/11.5km ■ Time: 4 hours ■ Grade: Moderate