The definition of a County Town is not definitively defined, although it is usually perceived as the most important town or city in that County.
Usually, it is the place of administrative and judicial functions of that County but because of boundary changes and various political reforms over the years this isn’t always the case
Prior to 1889, there were 39 Historic County Towns in England. Later reforms in 1889,1964 and 1974 have increased the number.
The walk passes through 48 towns and cities beginning with Truro in Cornwall and ending eventually in Morpeth Northumberland