They will hold the Land Tax Assessment returns for their county, any protestation rolls, full Tithe maops and their apportionments.
They will hold any series of publication made by the local history and antiquary societies dating back into the 1800s.
They will hold copies of any graveyard surveys and Monumental Inscriptions done by private or charitable groups.
They will hold many many local history records, sets of Burkes Peerage, slayers, pigots kelleys trade and town directories.
Old newspapers are spmetimes deposted there .
Any large local industry like the mines, mills, train companies etc will have depost=ed their archive there.
They will have computers where you can search the GRO index to birth death and marriage 1827 - 2005
They will have the LGS church International Genbealogical Index.
They will have Family Histories that have been donated by the public.
They have a huge map collectionm.
Burgess Rolls
Electoral Rolls.
Oath Rolls,
They will hold the pre-1858 wills and admons for any deanery, archdeanery or perogative court that is within their durisdiction.
They will provide4 free access on production of a couple of pieces of ID including addrtess,
You will get a readers ticket that should allow you access to any record office in the country.
you can only use pencils, no rubbers.
You can order photocopies in all sorts of amazing sizes.
They will all have a guide which details all their records.