In reply to FesteringSore:
I objected once to an application to build a block of flats just across a narrow lane from our house. In the end it didn't get built but not because of our objection, a year or two later someone else got permission to put up a really horrible looking block of student housing which completely blocks our view. We'd have been better off with the first building.
The system is stacked against you. There are consultants that can help but they usually work on the other side of the fence. We talked to one recommended by our lawyer and he was honest enough to tell us we had no chance before we gave him any money. It doesn't matter why you actually object the game is to find things in the rules you can use as an argument. Then they will pay consultants to tell the council why you are wrong or make some minor adjustments.
Unless you have a totally killer argument in the end planning will give in and there will be a meeting at which the council will nod it through. I got the minutes of the one that approved the one we objected to under freedom of information and basically either nobody said much or it wasn't written down: totally useless. We discovered that the Chairman of the Residents Association for our flats had written a letter saying the residents association had no objection to the development we were trying to get stopped - he was a retired architect and pals with the architect that designed the new block. If there's letters getting written against expect the developers to call in favours and get letters in support to balance it.
Probably you need to get enough people and publicity that the local Councillor gets worried they might get kicked out at the next election if it goes forward at which point they might be bothered showing up and opening their mouth at the meeting or having a quiet word with the planning guys.
Post edited at 22:58