I've just joined this forum, and have loved following this thread.
I lived in Blyth from 1936 to 1958. My parents left Blyth in 1966 but returned 1988 and I visited them there until Mum died in 2002. So I share many memories with some of you - especially the swimmers

That last photo , of the library and Hedley Youngs, much time spent there. I once had a holiday job there, selling hankies!
re the market square, who remembers Harper's fish shop? now round the corner I think.
Sadly I don't have any photos to share, except for a painting of my g.g. grandfather's ship The Messenger.