Britain's Concrete Peaks: Trig Pillars Seek Heritage Status

Trigonometrical stations, commonly known as trig pillars, are unique architectural features found across Britain's hills and moors. Approximately 5,500 of these structures, originally built between 1936 and 1962 for a significant national remapping project, still stand today.

Charity C20 Society is campaigning to preserve these pillars by applying for historic listing. They have submitted applications for the trig points at Cold Ashby in Northamptonshire and Thorny Gale in Cumbria, representing the first and last observed during the project. These efforts highlight the pillars' importance as functional remnants of a crucial mapping era.

These concrete obelisks have also become a beloved feature for outdoor enthusiasts. Many walkers, hikers, and climbers, often referred to as 'trig-baggers', actively seek out these pillars as goals for their expeditions. The internet and social media have further fueled this trend, allowing enthusiasts to share their visits and collections.

Historically, trig pillars were essential for the Ordnance Survey National Grid, designed by Brigadier Martin Hotine. They provided stable platforms for precision instruments called 'theodolites' to accurately triangulate the country. Though about 1,000 of the original 6,500 pillars have been lost, the C20 Society hopes its listing bid will ensure the preservation of these important pieces of Britain's heritage.