At Carbeth, just north of Glasgow, there are around 170 simple wooden huts tucked into an area of woodland. Basic and off-grid, they are part of Scotland's hutting tradition. Carbeth is the biggest hutting site in the country, with a history that goes back to the end of the First World War, when the landowner gave permission for people to camp and later to build simple dwellings, as interest in nature and the great outdoors grew. Since then, hutting has gone through peaks and troughs of popularity. Interest waned with the arrival of package holidays in the 1960s and 70s, but the 21st century has seen a revival. It's now hugely popular again, with a long waiting list for huts. In this programme Helen Mark visits Carbeth to meet some of the hutters and find out what the attraction is. She talks to a couple whose families have had huts on the site for generations, and who first met there as teenagers. She also learns about the recent growth in hutting, thanks partly to a change in Scottish planning law which has made it easier to build huts, after the"1000 Huts" campaign by the charity Reforesting Scotland. She visits a pilot site in Fife, where twelve new huts are now under construction. Helen also visits the site of the legendary Craigallian fire - a camp fire which was kept burning in the 1920s and 30s on the edge of Craigallian Loch near Carbeth. It was a magnet for early pioneers of the outdoors movement, who would sit around it discussing politics and sharing information about how best to survive in the wild. It became a stopping-off point for walkers and mountaineers exploring the Highlands. Helen meets a man whose father was one of the "fire-sitters", and who set up the monument which now commemorates those pioneering days. Producer: Emma Campbell