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It seems we were both wrong, I stumbled across the Natural History Museum's Identification Service yesterday and emailed a pic. They responded by lunchtime which was impressive!!
https://www.nhm.ac.uk/take-part/centre-for-uk-biodiversity.html
They are ash bark beetle, Hylesinus varius. They asked if we had any logs in the house (which we have!).
I took a look and you can see where they have come from:
Apparently they only live in ash bark and don't attack any other wood (so no panic for the furniture!). The logs have gone out now until the winter.
This little spider was in the log basket and must be well fed!
@ColinTheBald - that is a great specimen!
Anyone have any idea what these are? I seem to have a mini infestation of them on one window in the house. They fly and they are about 4mm long.
Top view
I wonder they are some kind of carpet beetle??