I doubt that you'll find what you require what you want online. However, your local record office should have them. It will be listed in your phone book under the name of your county (or unitary) council, not under the name of a district council.
Most record offices require users to register before they can access the collections. They require suitable proof of identity (such as a passport), so I recommend phoning before your visit, to find out what you need to take with you. Like public libraries, there are no charges for accessing the collections at record offices but they often charge large fees for any photocopying which you might require.
Alternatively, if you want large scale maps, covering just a local area, you might be able to buy a suitable map, for just �2.25 each (+ postage), from here:
http://www.alangodfreymaps.co.uk/
Chris