■ Distance: 9¾ miles/15.7km ■ Time: 5 hours ■ Grade: Challenging

■ Distance: 6 miles/10km ■ Time: 3½ hours ■ Grade: Moderate

■ Distance: 8 ½ miles/13.5km ■ Time: 4 hours ■ Grade: Moderate

■ Distance: 7¼ miles/12km ■ Time: 3-3½ hours ■ Grade: Moderate

■ Distance: 7 miles/11.2km ■ Time: 4 hours ■ Grade: Easy

On a leisurely weekend break, the last thing I expected to be wearing was a hard hat with a headlamp, a battery pack and a pair of wellingtons. But there I was, fully togged up – along with seven othe