OK, buckle up.
Nigel Farage is basically like the UK's Trump: he was the head of the UKIP party, which championed Brexit, and then became the dog that caught the car when Brexit actually happened. Since then, the Reform UK party has taken up the position of far-right-practically-Nazis in UK politics, and Farage is the head of that.
Farage is also an MP (Member of Parliament) for Clacton. Recently, he was embroiled in a scandal where he clearly took foreign bribe money. As an MP, Parliament can run an investigation of him for it. So he stepped down—pre-empting that investigation...but immediately stood in the by-election that was triggered. This way, either he loses the by-election to one of the other major parties—Labour or the Tories, which these days roughly count as "somewhat right of the US Democrats and a tiny bit left of the US Republicans", respectively—or he is returned to Parliament with a strong mandate, having defeated whatever candidates those parties sent to oppose him.
Except...they didn't send anyone to oppose him.
This means that he's basically a shoo-in to return to Parliament unopposed—meaning he has no mandate—to face his investigation.
...Enter Count Binface.
Now the options for him are "return to Parliament having faced no serious candidates, right into an official investigation", or "lose to the man with a bin on his head".
Neither of these are good options for Nigel Farage.