The 1906 Underfall Yard substation, on Avon Crescent, Bristol, had been designated as a Grade II Listed Building for it’s early and innovative use of concrete construction and as a rare survivor from a pioneering period of electricity development. It was built to service the adjacent docks.

The listed substation is among a number of structures around the Cumberland Basin to receive national protection. The Grade II Cumberland Basin walls and junction lock swing bridge have now been listed jointly. The swing bridges over entrance locks and Brunel’s south entrance lock have also been listed together “with greater detail about their historic and architectural importance”.

More information has been added to the listing of the “pioneering” Brunel’s swivel bridge, which has been categorised as Grade II* since 1972.

The change was part of Historic England’s review of the listed building and scheduled monument designations in and around the Cumberland Basin and Underfall Yard. Regional director Rebecca Barrett said the review has “helped to uncover what’s special about this historic part of the city, to help shape its future”. She added: “It confirms the importance of Cumberland Basin as a brilliantly engineered water management system, built and adapted to respond to the rapid growth of international trade in the 19th century. It’s an important place in Bristol’s story and in our national story.”