Okay, you have someone dealing with the appeal - but you now want to try to gather information and evidence that the councillors decision was "unreasonable".
You should try to go and see the file of your application, this should be a matter of public record, but may contain file notes and dates of conversations you may not be aware of.
You should try to gather information of other similar extensions in similar situations. Although this only has limited merit, it may help to question why this was refused whilst others (under the same rules) were not. It is important that they were built under the same rules and policies though so you may also want to find this out from the planning policy department or the website.
You could consider requesting information from the council under the freedom of information act. But it's difficult to know if you will actually be given anything of worth.
You should also try to speak with the planning officer, question him why he thought that the application was okay, but then ended up being refused. He may be tight lipped but it doesn't hurt to ask.
However, as you have a planning consultant already on board dealing with the appeal - they will be able to advise you much more accurately on this and may be able to put together the necessary information on your behalf. Speak to them about making a claim against the council.
You should try to go and see the file of your application, this should be a matter of public record, but may contain file notes and dates of conversations you may not be aware of.
You should try to gather information of other similar extensions in similar situations. Although this only has limited merit, it may help to question why this was refused whilst others (under the same rules) were not. It is important that they were built under the same rules and policies though so you may also want to find this out from the planning policy department or the website.
You could consider requesting information from the council under the freedom of information act. But it's difficult to know if you will actually be given anything of worth.
You should also try to speak with the planning officer, question him why he thought that the application was okay, but then ended up being refused. He may be tight lipped but it doesn't hurt to ask.
However, as you have a planning consultant already on board dealing with the appeal - they will be able to advise you much more accurately on this and may be able to put together the necessary information on your behalf. Speak to them about making a claim against the council.