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> The UK police intervene for even small possible internet offenses.

They obviously don't have the resources to do that.

> There was a story last year where someone was arrested because they posted a photo of them doing some fully legal shotgun shooting while on vacation out of the countr:

You only read reports about the things they do investigate, not the things they don't. There were probably myriad videos of shotgun usage posted last year, but only one arrest. The same would apply to almost any internet crime.

> If I was referred to law enforcement for any internet related offense in the UK, especially child abuse and CSAM, I wouldn’t brush it off as no big deal.

You would, like the OP, wait for them to show up at your door and attempt to explain it away then. Especially if it was, in fact, no big deal.