Recommendation on reading regarding British religious history, reformation, medieval stuff, all the various ‘ism’s’, anything and everything really.

As the title implies. I've just started to work in the heritage sector here. And, while my general knowledge of British history isn't bad, when it comes to all the specifics of churches and religions in this country, I'd say I know the basics-ish, but that's about it. The place where I'm now working revolves [...]