Thermafleece features on Great British Railway Journeys

Sustainable insulation manufacturer Thermafleece was featured in a recent episode of the BBC series Great British Railway Journeys, highlighting the role of British sheep’s wool in eco-friendly construction.

In Episode 8 of Series 16, host Michael Portillo journeyed from Maryport to Penrith, his journey taking in the beautiful valley of Martindale before travelling on to meet local farmer Garry Miller and learn about Herdwick and Rough Fell sheep, native breeds known for their durable fleece. These sheep play a key role in the region’s traditional farming practices—and, increasingly, in the green building sector.

The episode then followed Portillo to Dacre, near Penrith, where he visited the head office of Thermafleece. There, he spoke with Managing Director Mark Lynn about how the company transforms wool into high-performance insulation used in homes and commercial buildings across the UK.

“Wool is a remarkable material—naturally breathable, moisture-regulating, and thermally efficient,” said Lynn. “We’re proud to take a traditional British resource and apply it to modern sustainability challenges.”

The feature underscored a growing interest in natural building materials as the UK continues to push toward more environmentally responsible construction. Thermafleece, which sources wool from British farms, has positioned itself at the forefront of this movement.

The episode is currently available to stream on BBC iPlayer