Frances Byrnes' docu-drama weaves the voices of Sheffield's tree campaigners into a dark contemporary fairytale. Narrated by Robert Glenister.

Chestnuts on A roads, sycamores down alleys, rowans on roundabouts, and avenues of lime. Why do people care so much about urban trees? Perhaps they want to save the trees because the trees save them?

Frances Byrnes' docu-drama, narrated by Robert Glenister, weaves the voices of Sheffield's tree campaigners into a dark contemporary fairytale.

The poem Heartwood, a charm-against-harm, was written for Sheffield's trees by Robert MacFarlane.

Cellist Tim Smedley played A Song For The Birds by Pablo Casals. The programme also features a recording of the same piece by Sheku Kanneh-Mason.

Sound Design: David Thomas

Director: Kate McAll

A Pier production for BBC Radio 4