not radicals any more, the EPP in particular could not give birth to moderate (right-wing) EUro-skepticism because it is an explicitly pro-federal party.
this probably results from so many national electorates being left without a mainstream party that campaigns on a EUro-skeptic ticket.
i cannot speak for poland, but britain's choice results from its post-colonial/WW2/socialist hangover where the country perceived itself to be in a state of perpetual decline, and popularly dubbed as the "sick man of europe".
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