Planning 4 and 10 Year Rules
These are most relevant with Lawful Development Certificate Applications and Appeals and helps gain a permission where a development or use meets the minimum requirements of these rules.
Be aware evidence is paramount for these types of appeals and the balance of probability must be met, this usually involves sworn statutory declarations to support images and documents and failure to do so often results in an enforcement notice being served.
If what you are applying for is important and you wish to retain either the development or the use then it is very much worth while ensuring all Lawful Development Certificate applications are handled by both a planning and legal team. We happen to have both of these teams in our organisation.