Give an example.
No it isn't. There are no regulations about me doing my own wiring. I can rewire the whole house if I wish. Garages, conservatories, anything that isn't an actual "extension" do not require permission. Check the government website.
It's already here, what's your point?
State why.
Bullshit, check the government website, there is a percentage of glass for it to be classed as a conservatory.