In Lewes for example (one of the biggest celebrations in the UK) they still burn an effigy of the pope every year. These days they burn Trump too, but the anti-Catholic traditions continue.
A particular quirk of British people is that we're very bad at stopping things that are considered traditions. We carry on with them long past the time they were relevant, maybe because none of us wants to be the one to question them. I doubt there's any anti-Catholic feeling in Lewes at all, but a lot of people who go along with burning an effigy of the pope because that's what they've always done.
As a more obvious example, Lewes bonfire society only agreed to stop blacking up for Nov. 5th this year. https://www.theguardian.com/lifeandstyle/2017/nov/05/lewes-b...