Wait a minute. ... there was a James Cook Read born in Newcastle in 1901. Could this be your James and could he be the son of the James and Jane above?
Perhaps this could be the missing link on why they came to this area? This was his family's home area perhaps?
If the fish merchant is your James relation you are fortunate as there is a file on them at North Shields library and a photocopied old fashioned photo of their old shop with 2 men and a little boy in front. There is also a write up on a William Read of the fish merchant who was found dead in tragic circumstances (drowned in a barrel of water) in 1925.
The local fish merchant James Read is written of as 'Well known and highly respected' - he appears to have been very highly esteemed as far as I can make out.
If this turns out to be your James family you could contact North Shields library and ask for photo copies of what they have in the file. There is a lot of information both hand written and in print.
I am at work again from tomorrow but I will keep digging for you now and then when I can.
Best Wishes
AMENDMENT: James would not have been son of that James if James and Jane married 1929. What am I thinking! However, perhaps he may be the son of one of the other sons.
Unfortunately, I have to go now but I think there is much to look into further on this thread perhaps?
If you can let me know any more on what you know this may be of help?