For a walk which visits quiet hills and explores post-industrial dereliction, Eryri ’s Moelwyns are second to none.

Kerry Walker takes a road trip through Bannau Brycheiniog National Park

When the weather gods deem the mountains of North Wales inclement, there’s a group of hills nearby that nearly always defy the order from on-high. The Llyn Peninsula’s Yr Eifl, is a case of three for one, and all in half a day.

■ Distance: 8½ miles/13.7km ■ Time: 5 hours ■ Grade: Challenging

■ Distance: 9¼ miles/14.8km ■ Time: 4 hours ■ Grade: Moderate

Jim Perrin revisits a minor but notable hill of the Rhinogydd, in the fine company of campaigning photographer Fay Godwin and archaeologist Peter Crew