Planning permission and enforcement in this country is laughable.
Developers have pre application meetings and sort out a deal with the council before the public is even made aware. Councils are "bribed" with money for local amenities etc in exchange for planning permission.
Planning that is turned down goes to appeal to the Secretary of State who overrides the local council.
Neighbours are allowed any old extension into their garden no matter the effect on neighbours so long as the 'street scene' is ok.
You can build whatever you like and get retrospective planning permission for it because enforcement isn't deemed worth it.
If you bulldoze your site before applying for planning permission, the council can't see the habit and mature trees that were there before so can't object on those grounds.
And, if your building 'accidentally' burns down, you can build on the site with no consequences.
People get away with it all the time. It's awful and makes this country horrible to live in. Planning permission needs to be a thousand times stricter.