...in which we stride out from Seatoller in the company of conservationist and lichenologist April Windle to explore the Celtic woodlands of Borrowdale and celebrate the designation of a new 721-hectare (1,782-acre) National Nature Reserve in the valley.

Immersing ourselves in the damp and shady confines of an oakwood, and tantalised by a tapestry of ferns, mosses, liverworts and lichens, we consider the climatic conditions – wet and mild – that sustain these rare pockets of western wild-wood. Pushing deeper up-dale we discover two more woodland habitats: a remarkable hillside of ash pollards and a precipitous hanging hazelwood.

Pausing to admire 'Tumbling Kittens' and 'Blackberries in Custard', we reflect on the complex management needs of these threatened rainforests and learn why bracken is no barrier to natural regeneration, why brambles cannot be left unchecked, and why livestock exclosure does not make for healthy woods.

Backtracking to the valley bottom, we learn about the National Trust's largest ever 'translocation' drive and lament the loss of one of Lakeland's most loved trees; we mull the benefits of slow walking – and a £2.50 hand lens; and we celebrate Cumbria's reputation as a hotbed of conservationism.

April can be found on X at x.com/aprilwindle?lang=en and on Instagram at instagram.com/aprilwindle.nature/

To learn more about the lichens of Borrowdale, see the Lichen Society's interactive map at https://britishlichensociety.org.uk/maps/all-species