Austerity measures predate Brexit by quite a bit as a result of deliberate choices by a conservative government. Brexit accelerated pre-existing downtrends.

Many parallels may be drawn: austerity vs DOGE in gutting government services, the deluded nativist/isolationist core of Brexit vs the tariffing the entire world, xenophobia, and most obviously a nostalgia of past-greatness that doesn't quite fit the present circumstances.