When planning permission is granted it is usually subject to conditions.
These conditions restrict what you can do with the property and will often have an adverse effect on its value.
I can help you apply to the Council for permission to develop the land without complying with the conditions.
For example, if a property is subject to a condition that it can only be occupied by a person employed in agriculture and you can establish that there is no longer a need for such accommodation in the locality, the condition can be removed and you will be free to sell the property at its full market value.
A similar situation may arise where you want to use a self-contained annex independently of the main house, perhaps as a holiday let or to sell off as a separate residential unit.
You can appeal against the refusal of such an application.
If a condition has been continuously breached for ten years (or in certain circumstances, four years) it is unenforceable you can apply for a Certificate of Existing Lawful Use or Development.