St Denys’ carries one of the earliest stone broach spires in England, raised around 1220, though it was largely rebuilt after a lightning strike in 1884. The finer survivals are the 14th-century Decorated windows, whose tracery is about as intricate as English masons attempted. It stands right on Sleaford’s market place, five minutes north of the station, with Cogglesford watermill a short walk out along the river.
