Oddly enough, despite being extremely well travelled around this country, I have never seen such a notice, and I certainly would not cross the threshold of any pub that displayed one. That doesn't prove anything of course. It could be that I am just in the habit of drinking in pubs where they don't put such notices up.

A few howevers, however:-

I have stood on the front line of many an anti-fascist demo and been called a paedophile and an IRA murderer by the fascists. Needless to say I am neither.

About ten years ago, a notice was placed in a folk festival reception office informing punters that the landlord of one of the local pubs had been refusing to serve asylum seekers. Hopefully he did not enjoy the patronage of any of the festival goers that weekend.

Many years ago, during Whitby festival, the landlord of one of the pubs put up a notice which read "NO HIPPIES OR FOLKSINGERS". This despite the fact that the vast majority of festival goers are highly respectable and very well behaved.