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I have had quite a few of these questions recently where the council have been granting consent to other properties and then suddenly, with no reason or logic, they just changed the criteria and stopped allowing consent under exactly the same circumstances. That appears to be the situation that you are in.
You can appeal the councils decision (each council has a different process so asked them for the appeal process) and tell them that if your appeal is not successful, you will make an application to court for judicial review stop you can only judicially review a decision of the local authority on the grounds that illegal, irrational or they have followed the correct procedure. It doesn’t actually change the decision, it just makes the council revisit the way the decision was reached. The end decision could still be the same.
The problem with judicial review is that it is expensive and if you were to be unsuccessful, you could be on the thick end of a bill for several thousand pounds probably and even as much as 10,000.
What you can do, and which is free and risk-free, is make a complaint about the conduct, to the Local Government Ombudsman if the council steadfastly refuses to change its stance.
. Can I clarify anything else for you?
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