I've now discovered the names of some of the businesses which occupied the building I'm particularly interested in: 215 High Street East, Wallsend.
- 1916, occupied by Mr J. Cosans, butcher
- 1921, occupied by William Coupe, butcher
- 1936, occupied by my ancestors W. and H. H. Stainthorp, butchers
Someone off-list has pointed me towards North Tyneside Libraries' collection of 50,000+ local photos [
link] which I'll try next time I'm in the area.
They also have a good collection of trade directories [
link] which might help me to narrow down the year when my great grandfather took it over.