This means it won't always flag up on an HPI or similar check as having been written off, and will be classed as Unrecorded.

Does Cat U affect insurance?

Category U cars are what are known as “unrecorded insurance write offs“. This happens when the vehicle was involved in an accident of some sort but the damage wasn't reported to the insurance company – this sometimes happens when the driver is uninsured.

Does cat's show on logbook?

The DVLA must be told if your car has been declared a Cat S write-off. You'll receive a new V5C (vehicle log book) marked to show that the car has been written off. ... Likewise, your insurer will notify the DVLA if your car is being scrapped or sold for spares.