I went to Gateshead Library last week, but it is being refurbished and most of the records are being held in storage; although if you know what you want they can get it with 24 hours notice.
I went to Durham County Hall yesterday, but merely confirmed what you have already told me. County Hall have the document about the workhouse, but someone was using a laptop transcribe the whole book and I will have to go back when the document is available. I intend to go to Newcastle Central Library where there will be documents relating to Heworth.
I found a site listing burials in CLS, Pelton, Sacriston & Lumley which may prove useful to anyone who dosen't know about it.
http://www.durham.gov.uk/pages/Service.aspx?ServiceId=6718