Is the roof mounted light blue or orange? Orange lights preceded the change over to blue, which did indeed get started around June 1960, but this attachment could have been earlier. And some brigades simply switched the lenses from orange to blue, instead of (or before) buying the rotating lens beacons.
Ed: it could even be an aircraft light being near London Airport.
Similar gongs were fitted to Volkspolizei fire tenders in the 1950s in the DDR, until they switched to two tone air horns. I never knew they were used on steamers.
Ed: it could even be an aircraft light being near London Airport.
Added by Rob Johnson on 11 July 2023.