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We get these falling (or appearing) on our desks - we think they may be from detritus from birds on the roof!
Any help appreciated
They look to me like the well known Drugstore Beetle (Stegobium paniceum).
Here is a photo of Stegobium paniceum:
Here is a photo of Cis nitidus for comparison:
It seems to me that Cis has shorter legs and bigger pronotum, shinier elitrae, etc.
I hope this helps.
Yes identified as biscuit beetle / drugstore beetle - certainly ties in with the fact pigeon next on the roof and the mess comes onto the false ceiling from time to time!