Pleased she found it Steve, not sure if Delaval Car Accessories is still there, but Carltons the animal feed supply store adjacent to it, has been there years and years.
https://firstname.lastname@example.org ... 312!8i6656
Wouldn't be that difficult to have them as working lanterns, haven't seen any photos of them lit up so I expect they aren't. There's about 3 near Seaton Sluice Harbour, and another which is listed like the one in Sheffield Bobins mentioned in the Estate as you leave Seaton Sluice heading for Whitley Bay, at Old Hartley. The ones at Whitley Bay/Monkseaton are all in the light green paint.
Not sure what they do with the Sewer Gases these days.