I like the colours you're using. Generally looking good. I think it's been mentioned already, but it's a good idea to keep consistency, particularly to cover the south of England than just put 'south coast'. Kent is named closer to London that London is. If you have space (like with Kent) if you put the tag in the center of the county it will look better and less confusing.
Also for Tayside, you've included Fife too. so either need to say 'Tayside & Fife' or put in the borders and make Fife separate. Here's more info...
The map link Valarian put up pretty much covers the detail you need for the counties
thanks for showing!