That's right @Katherine Hyde. The name 'Mill Bank' and 'Mill Bank road' appear on many late 19thc and early 20thc maps but I don't think I have ever stumbled across anyone explaining exactly what the Mill Bank area was about (to me). The council houses, Millbank Place, were built (just like half of the council estates in Bedlington) after WW2. Our family moved into our council house, Coquetdale Place, in 1949 whilst they were still building the estate.
I had a look at the old maps that are available for 1921.
Two show the area where Haig and Beatty road are as clear :-
The 1896 map also has Mill Bank named :-
But then a 'Revised' 1921 map shows Alfred Road, Rosalind Avenue, Haig Road and Beatty Road but is does show them as blank sections suggesting they are under construction :-
Then the 1937 map shows as the semi-detached houses :-
This is the two 1921 maps joined together :-