But like I said earlier, nice quiz :)
In the U.K. county towns has a specific meaning. The administrative centre of the county is the county town, e.g. Morpeth in Northumbria. So changing the question to towns in the county rather than county towns would be more accurate.
Also, some of the towns aren’t towns. For example, Broadlands is a Lrge commercial area to the east of Norwich and the name of the wetland area in Norfolk.
Some of the clues are too easy as the town is a prefix of the county
There’s way too much time allowed
The fact that the answers are in alphabetical order also provides extra clues