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Ditto.
I speak from a vast pool of anecdata of buying a house.
Our (full fat, all the bells and whistles) survey brought up that plans were different, and there was no building control sign off.
The bank's separate (as full fat as they mandated, for which we paid an additional £1,000) survey may have brought up the same. It didn't affect anything.
I asked our solicitor if we should follow up with Building Control and Planning, and he asked why bother?
We paid £50 for insurance against being pinged for it.
YMMV, of course.
NotThamesWater
If the layout doesn't match the plans on record, then solicitors and surveyors will ask questions and may want proof of compliance. Valuations for a mortgage are often £0 until this is sorted.
As a structural engineer I often get asked by people in a panic trying to buy/sell, to provide calcs or a report for walls or chimney breasts etc taken out previously without building control approval.