Well I think you misunderstand my post entirely. Note I said this:
I think they like to try and talk/intimidate you out of doing it when maybe you might well be within the rules, its just they don’t like the idea..
We used an architect and planning consultant, spent about £700 in total. Our planning consultant is ex council planning so knew all the tricks.
Hence the tricks I was referring to, were knowing what the sneaky chaps in planning would do to try and stop you from doing what planning law says you are legally allowed to do. In my case the planners tried to intimidate my architects into backing down, but they, and our planning advisor, know what is legally permissable and had designed the plans to be legally permissable. So we did not budge and in the end the planning was approved without any change.
Secondly I am entirely unconvinced that a tasteful extension next door will devalue your home. Any verifiable evidence? I am also unconvinced that it is right and fair that you should be able to prevent someone from making alteration to make their home better, because of some unfounded view that it will de-value your home. The value of a home is in what it is like to live in. Which applies equally to both parties.