Not everyone from the UK is English or indeed has a London accent...
That is true. Especially these days, even in London.
But England completely dominates the politics of the UK.
FWIIW this sounds English to me. They bought us the Magna Carta that made Kings subject to law, but they have never been free.
Different kinds of freedom. In London you can legally jaywalk naked while drinking a beer in front of a cop and know that even if you really pissed the cop off, you'd never get shot for it.
Anyway London accents don't go "oi". This is a Birmingham accent. London accents go "ah".
Here we have a caricature which is irritating because it's off the mark. I demand better mockery.
To be fair, Brits seem to think New Yorkers go "oi" and they don't really either.