When did London get a new Suburb?

When did Brighton and Hove become part of London ? :imp:
Cyclists , Ubers , Buses and mopeds on a kamikaze course with the truck
pedestrains with death wishes
Car , van drivers who are blind to a great big 44t truck coming down a narrow street they’ve just blindly turned in to :unamused:

It’s long been regarded as London on Sea and best avoided.
The rule give way to traffic established or turning etc or pedestrians on a road that you’re turning into seems to no longer apply.