Wow, thanks so much for all your replies.
Goughy, that indeed seems to be them and would love to know where I could find out more. It is really strange because William was a stonemason and was listed as having his own business in the 1841 census and so the fact that his sons were stonemasons ties in perfectly. I'm now wondering if those in Pocklington aren't the right ones after all, except it's a big coincidence that the names and ages of the children are almost exactly right (but with two new additions since the 1841 census) in this case Edward aged 6 and Alice aged 4 (Alice was my great great grandmother and tragically dies in a house fire aged 38 but that is another story, she was actually born in 1845 but the census may well be two years out). In the 1851 census, William is listed as a lodging housekeeper and I'm wondering if this is the son (as one of the older sons he was thought of as the main householder) and this is why he's not listed as a widower. We also have daughter Hannah listed as housemaid. Of course all this information was gleaned from microfiche years ago, although my mother did go up to the record officers. Your information is virtually identical the info I have as listed in Pocklington, apart from the fact that Hannah the mother isn't mentioned which is why we thought she'd died.
Thanks so much too, Carol. Yes, that is the marriage of our Hannah Horrocks to William Story but the death information is really helpful. It may be that we disregarded that one because we were looking for a much younger Hannah Storrie/Storey.
Where can I find out more? I was able to get onto a free ancestry forum a few years ago but I don't mind paying for one that has detailed information.
Thanks so much again!