Redheads Sweet Factory is next to the (soon to be demolished) "Big Club" next to Morrisons. My fmily worked there in the past and a member of my living family currently resides n one of the apartments that it was converted into. (Or did red heads move to another building?)
As for Blyth Tool Hire, know that building well....for a 21yr old that is, grew up playing around it

My dad know the bloke who owned it.
I always thought it was something to do with the railway or some off shoot of the railway business, because it's similar to the Bike shop (Two Wheel City) next to Morrisons, with doors at the top and pulleys.
I'm speculaing it could be a Warehouse. But i'm probably waaaaaay off lol