Well here's me thinking my Dad was hardly ever wrong about anything, it turns out he was wrong about his grandma's maiden name, wasn't even close in fact, she was Ellen Jackman, not Ellen Reddington so goodness knows where Reddington came from.
I've checked the BMD records on the link someone put up when I first posted and there's a marriage in Salford in 1897 between John Dolan and Ellen Jackman which I think I can safely assume is my g grandparents.
I've just ordered a copy of the marriage certificate.