Had a phone call from a helpful lady called Lynne at the burial office in South Shields.
The last recorded sale of a burial plot in Westoe Cemetery was in 1953 although as said before, it is still open to burials in existing family plots.
When Harton Cemetery was opened in 1891, within a decade it had replaced Westoe as the place of choice for people to be buried in. I suppose it was a natural change as the population of the town began to expand and move out of the Tyne Dock & Laygate / Westoe area further afield to Harton, Horsely Hill, Cleadon and other outlying areas which were previously sparsely populated and mainly farmland.