Cirencester gutters, specifically
Why gutters matter more in a limestone town.
Cirencester's older roofs are steep. A Cotswold stone-slate roof is usually pitched at around 50 to 55 degrees, and before gutters were common the large stones at the eaves simply overhung the wall and threw the rain clear. The gutters came later, often on brackets fixed straight into the stone. On a roof that steep, heavy rain reaches the gutter fast, so a part-blocked outlet doesn't just drip: the whole run overflows down the face of the wall. Cotswold stone is porous, so a wall that's soaked every time it rains stays damp, stains dark below the gutter and is open to frost damage in a hard winter.
Cirencester also has a lot of big trees close to houses. Cirencester Park, wooded on its north and west sides with mature beech, borders Park Street and Park Lane. The Abbey Grounds have mature trees with the Churn running through, and there are tree-lined banks along the River Walk, City Bank and the eastern edge of Watermoor. Houses near any of them take a heavy leaf load each autumn, on top of the moss that washes off the roofs all winter.
Moving out from the Market Place, the old centre is limestone under stone slate, Watermoor is mostly Victorian terraces in brick and limestone under Welsh slate and clay tile, and The Beeches, Kingshill, Chesterton and Bowling Green are post-war and newer estates with PVC gutters. The Steadings, south of Chesterton, is still being built.