The plan I have attached is part of an underground plan of the Doctor Pit Low Seam workings so I know you will understand it. The blue markings are underground pillars and the thick blue line is an igneous dyke.
You say you moved into no 13 Hollymount Square around 1947 when it was only half built.
Some underground plans had to show certain surface features and by pure chance, the buildings on this this plan were added when Hollymount Square was only half built so it shows half of Hollymount Square as well as Bells Place and Old Colliery Row. Shortly after this plan was drawn up, the old rows were demolished, the site cleared and the other half of Hollymount Square was built.
What is surprising is that the main underground plan shows that the Low Seam workings under Hollymount Square were mined from the ‘Auld Pit’ (Bedlington ‘A’) not as you would expect, from the Doctor Pit.