I believe that you have to apply to the county council sending them a copy of the map/land registry/ordnance survey map. They will decide whether or not it is in keeping with their development plan for the town/city. You will have to apply for zoning of a particular type i.e. commercial/residential. they will decide on the application. i think what the previous poster was hitting on was how you may improve your chances of such a decision coming back in your favour/positively....thats a whole different topic and one which im not sure would be suitable for a public domain!