Now, a campaign has been launched to protect and restore these metal fences, mainly found on estates in South London, that had served so well as stretchers during World War II.

Rosie Shaw, founder of the recently formed Stretcher Railing Society, said: “They have a fascinating history that many of us are unaware of. We want to work with councils and conservators to try to preserve these amazing railings which are such an important part of our heritage.

“Some are now rusting, others have bits missing, a few have been badly damaged. The goal is to save the ones that can be saved. However, some councils do not know what to do with complex restorations.

“Our long term aim is try to get some kind of funding for conservation work. It would be a great shame if they were allowed to fall into disrepair.”