What could possibly happen to you? You could be prosecuted for allowing the vehicle to be driven with no insurance and it would depend whether the magistrates accepted your version of events as a defence as to whether you will be found guilty or not.
It’s the same offence is driving without insurance under section 143 of the Road Traffic Act 1988: using, causing, or Permitting. It carries up to 6 penalty points and a fine.
There is case law however, Newbury v David 1974 that you do not commit an offence if you allow someone on the express condition that they are insured or they arrange insurance. It depends whether the magistrates accept that was the case.
You gave the drivers last known address and therefore you have discharged your duty to provide the drivers details under section 172.
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