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Hi Ryan, if you take all the pale grey areas of the wings and imagine them being dark brown, I think you end up with markings that are consistent with A. anthrax. If that is the case then as Michael suggests it seems likely to be a recently emerged individual, or else a very unusual form with reduced markings.

I'm not an expert on bee-flies outside the UK, but I can't see any better matches in John Smit's key for the Netherlands/Belgium species.

It's an amazing record for Northern Ireland in any case! Although presumably a human-assisted import?

In 2019 it was breeding successfully in at least one site in southern England.