Having lived in a couple of countries in Europe, including a decade in Britain, I would say the UK is one of the most Fascist countries in Europe (for example having a citizen surveillance system even more extreme than the US and Press censorship in the form of D-Noticies), though elites there are extremelly good at being subtle and posh about it so the will keep up appearences: you won't see goose stepping on the streets but for example in peaceful demonstrations the police will charge the crowd and News will report that - by showing the footage in the inverse order - as people first charging the police who then responded to it and you won't see an overt Secret Police but once in a while out pops a leak of a special group within the normal police infiltrated Ecologist groups with undercover police officers (which came out because some female Ecologists ended up pregnant) or how their surveillance organisation kept Greenparty leaders under surveillance.
Back during the Nazi times the British elites were even pro-Nazi (there's a picture of Queen Elizabeth as a child being taught by her uncle - then King - to do a Nazi salute) and it was only the Nazi invasion of Belgium that changed their minds, so geopolitics rather than a dislike of the Nazi ideology of ethnic superiority (notice how over the years British elites kept supporting white colonialism and their violence, from Appartheid South Africa to Genocide Israel). More in general, the elites over there (which are overwhelmingly dynastic in nature, and I don't mean just the Royal Family) are strong believers in their own inherent superiority over others as justification for their wealth, so the whole ubermenschen and untermenschen thinking applied along class lines rather than just races (but races too: Brits tend to believe themselves superior to just about all foreigners but Americans and for example some of the most celebrated heroes of Britain - such as Churchill - actually ordered the execution of Genocides in the British Empire possessions).
All this to say that to me, having lived over there for a decade, the British's minimal response to Fascism compared to the rest of Europe isn't surprising - they live in a Society than in many ways runs along similar molds, harbours similar ideations about the inherent worth of people and is (including the Press) controled by elites who mostly are the same families that supported Nazism before Hitler invaded Belgium.