Will i get arrested for telling a sick joke about Princess Diana and the Queen online?

The laws seem to have changed recently, and more people are getting arrested for making sick comments online. Will i get arrested for telling a sick joke about the Queen and Princess diana on a forum that a lot of people visit?

P.S Please don't post replies, about how i should respect the royals etc. I just want to know of the legality of the comments.

P.P.S Yes i know jokes about Diana are low, but i don't really mean it.

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