They have support because the Tories no longer stand up to them, in the 70s 80s and 90s, the Cons rejected the far right, now they embrace them, giving first Ukip and now Reform, legitimacy.
Some Tories are supporting a Reform/Tory merger, why shouldn't people vote for them?
Immigration, yes out of control... under the Tories, Brexit has led to the UK having to get workers we need from Africa Asia and these people bring dependants, why wouldn't they? a worker from Europe is just a couple of hours away, could have transferred CB back home, no need to bring their families here in most cases.
Brexit has led to large numbers crossing the channel, we don't have much of a relationship with france/EU now.
the divisions in the country have been caused by the Tories, Austerity, Brexit, Culture wars.... find a controversial issue and magnify it, the latest one is Trans, they never seek to calm tensions.
I don't believe in WC whites face discrimination, there is certainly a lack of ambition but again, who has been in power over the last 14 years?