3 ideas
In a fascist Britain, the dictator Frank Hillier depends on the financier Thomas Chamberlayne for backing. Hillier agrees, Sacker is killed, and the regime survives by destroying the loyalist who helped build it, an English version of Germany's 1934 Night of the Long Knives.
A mass fascist movement takes power on populist and anti-capitalist promises, but it keeps power by allying with finance and industry. That alliance forces the leader to destroy the wing of the movement that believed those promises. What stabilizes the regime is not the revolution being fulfilled but the revolution being betrayed from inside.
Educated and liberal people rarely endorse a dictatorship outright. Instead they make small private accommodations: keeping their jobs, avoiding certain topics, and reasoning that things are not yet as bad as feared. Each adjustment looks reasonable on its own, and together they make up the passive consent the regime needs.