Due to all the recent announcements regarding the fact that the historic county borders of England still exist, I have tweaked the England page. If you go to the UK tab, and down to England, two options will come up.
1) Administrative Counties
This will let you run through the modern day districts and counties, including new ones such as Greater Manchester, and ones that replaced more than one old county like Cumbria.
2) Historic Counties
This one however will let you go down a list of the historic counties, reinstating areas like Cumberland, Westmorland and Huntingdonshire, to find out which places in new counties today would actually have been part of others such as Cheshire, Lancashire or Warwickshire for example.