On your way here, you may have seen signs to the village of Shobdon and the adjacent Shobdon Airfield. It was one of the many airfields built in 1940, as part of what was collectively perhaps the biggest civil engineering project undertaken in Britain. At that time a modest, privately owned quarry was operating at Aymestrey. The wartime government used its compulsory purchase powers, ensuring a local supply of stone for the airfield. In its latter years, the quarry was run by Hanson Aggregates.

I don't suppose that anyone at Hanson Aggregates expects, in the fullness of time, to be remembered for their landscape architecture in the same way as Lancelot 'Capability' Brown or Richard Payne Knight, but they should at least be commended for trying.

Landscape continuum

Unfortunately you will not be best placed to judge the quality of their 'seamless' landscape restoration, since I've primed you to look out for it. Nevertheless, towards the end of the walk, as you descend to the former quarry area, there is little to indicate that the immediate landscape has been recently manufactured, although your curiosity may be alerted by the absence of any really substantial trees. Unlike many quarries, the plan here was not to provide any sort of lake-based recreation, but to return the land to a mixture of agricultural use (sheep grazing, it seems) and woodland.

In geological time, man's quarrying is scarcely a moment. Unfortunately, working out a quarry can take up a fair amount of a person's lifetime – people tend not to like quarries in their backyards, so quarries often get a bad press. The quarry companies will argue that 'restoration' and 'environmental sensitivity' were among their objectives a decade or two before their current fashionability, and that, far more often than not, sand and gravel quarries are returned to a level of agricultural utility that at least equals the one before.

Glacial gorge

West of Aymestrey the River Lugg runs in a small but spectacular gorge. This is a glacial overflow channel that exploited a fault in the rock, associated with the glacial Wigmore Lake. The paucity of contours on the suggested map a few grid squares to the north shows the position of the former lake.

At Mortimer's Cross, Richard of York's son Edward defeated the Lancastrian army in 1461 in one of the battles that changed the course of the Wars of the Roses (Edward was crowned King later that year). The battle site is 0.5 miles (800m) south of the road junction named Mortimer's Cross. The cross itself dates from 1799.

Walk up the access road for 750yds (686m), until just before a junction of tracks. Note a stile on the right – your route returns over this.

Turn left then, in 25yds (23m), curve right, passing a seemingly nameless house with a stone wall relic in its garden. Shortly curve left to walk through Yatton, to a T-junction. Turn left to the A4110. Cross directly to a stile, striking across this field to a gap. In the next field veer left to skirt round the right edge of (not over) an oak and ash embankment, to find a corner stile. Walk up the left edge of this field but, at the brow, where it bends for some 70yds (64m) to a corner, take a stile in the hedge to walk along its other side. Within 60yds (55m) you will be in a clear path, steeply down through woodland, a ravine on your left. Join a rough driveway to a minor road. (The glacial overflow channel is directly ahead.)

Turn left here, joining the Mortimer Trail. Enjoy this wooded, riverside lane for nearly 0.75 miles (1.2km), to reach the A4110 again. Cross, then walk for just 25yds (23m) to the right. (The Riverside Inn is about 175yds/160m further.) Take a raised green track, heading for the hills. Then go diagonally across two fields, to a kissing gate and wooden steps.

Within a few paces fork left to ascend steeply through the trees. Leave by a stile, to cross two meadows diagonally. Over a double stile, walk along the left-hand edge of a field, still heading downhill. At the trees turn left. Soon reach a tarmac road. Turn left along the road, now going back uphill. Beyond Hill Farm, enter the Croft Estate. Walk along this hard gravel track. After 110yds (100m), ignore a right fork but, 550yds (503m) further on, you must leave the track. This spot is identified where deciduous trees give way to conifers on the left and you see a Mortimer Trail marker post on the wide ride between larches and evergreens on the right, approximately 250yds (229m) on from a large, green Croft Wood sign.

Turn left (there is no signpost). Within 110yds (100m) go half right and more steeply down on an aged stone path. Within 250yds (229m) look out for a metal gate, waymarked, leading out of the woods. Walk along its right-hand edge, admiring the former quarry's new landscape. Walk briefly in trees then out and, at the far corner, within the field, turn left to return to the stile noted earlier. Go over the stile and retrace your steps to the start of the walk.