I think the problem with discounting some objections as nimbys is not everyone is capable structuring a letter opposing specific planning points and counter arguments that have been prepared professionally.
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You really need to be a professional planning application objector with local knowledge and a lot of time to spare to do what’s being asked.
An objection just needs to raise the issue, not the details of it. Its down to the council to ensure the correct response has been considered, however its rare the ‘public’ can raise anything new that’s not been considered in what are typically very thorough communications between those raising the planning application and the council (and its representative).
The implementation of the plans is a different matter, and something councils are amazingly shite at policing, just as they are policing their own blunders.
Local case to me is an new estate near me. Massively opposed by locals (especially those in the other new houses next to it, go figure) but the planning documents if they bothered to read them were pulled apart by the council and made to re-submit as the main issues, traffic, were not suitably considered. Other things like environment, water drainage, etc. had all been gone through with environment agency reps.
There is another case coming up soon for a large open cast mine just outside the town, I presume from the froth on here we can count on your support to oppose this menace with internet petitions 😆