Sudbrook was of early historic importance in guarding the Severn estuary at an ancient ferry crossing place.

A manor house and other village buildings stood nearby but later moved inland, probably when climate changes in the 14th and 15th centuries led to the widening of the estuary and the erosion of the cliff.

[1] Most of contemporary Sudbrook was built further inland by the Great Western Railway as a company town[6] for workers on the Severn Tunnel below, which began construction in 1873.

The first cottages were built by contractor Thomas A. Walker in 1877, and rapid development took place over the next decade, including a school, post office, mission hall and infirmary.

[7] The steam engines were replaced by electric motors in 1962, and the chimney stacks taking smoke from the furnaces were demolished in 1968.

The team later played matches within the Iron Age camp, before moving several times, eventually to Caldicot where it remains.