I am writing a contemporary theatre play where one character - a senior businessman - first introduces himself as a not particularly conservative person. Later in the play, his protégé finds that the businessman is in fact deeply conservative and wants to express his anger over the deception. I'm therefore looking for a british word that can insult Tories or conservative persons in general, emphasising that it is the conservativeness that the insulter takes objection of.
I started with "Twit", which might remind of Monty Python's "Upper Class Twit of the Year", but I have the feeling, that this is not a particularly strong insult these days. Since I'm not a native speaker, I have trouble in general estimating the strength of insults.