There are several reasons Reform UK is gaining popularity:

Open support for the extremist and genocidal Islamist organisation Hamas, which has pledge to the extermination of the Jewish people, as well as a rise in people threatening Jewish people and families in public.

People who also attack MPs who speak in their defence (not to mention the murders of David Amiss and Terence Carney), and a police force that does little to nothing to stop them or protect those they threaten (including defending people flying swastikas), and an increasing number of lone wolf attacks by Muslim extremists on British civilians.

Record high illegal migration, mostly of fighting-aged men posing as teenagers, many of whom are violent criminals, and the politically correct brigade rushing to their defence by overplaying the racism card.

The UK healthcare system has been reduced to waiting lists of up to 7,000,000, as well as an abortion system that discriminates against women with Down Syndrome and other physical deformities.

A government blinded by the goal of net zero for a country responsible for a tiny percentage of carbon emissions, by impoverishing the country (including the already disadvantaged working class who left-wing parties claim to represent).

Not to mention the trans ideology that has gotten so out of control that it is attacking women and allowing males into female lavatories and hijacking female sports, giving them an unfair advantage in both, as well as the immediate demonisation of anyone who dares to critisise this.

And out-of-line EU supporters so blinded by their misguided loyalty that they disown their nationality, claiming to be European over British and speaking in favour of a European superstate and who go on to blame Brexit (whatever your opinion on that) for all of Britain's problems (other than the ones mentioned, of course!) even though polls suggest that only about 15% of Britons consider this a priority issue!

All of these to name but a few! You may not agree with everything Nigel says (I don't, for anyone wondering), but when people are labelled far-right or racist for voicing their legitimate concerns, and forced to choose between a party that has pledged to find a solution to most of these problems, and a system of establishment parties that keep making the same impossible promises but are instead susceptible to the whims of a small group of people, what do you expect?

I rest my case.