Registration plateGrey Fiat 500l, manufactured in 2015, first registered on 1 April 2015. Cylinder capacity: 1248cc, CO2 emissions: 109 g/km. As of 12 April 2018 this vehicle had done 21,331 miles.
The insurance company would pay out other parties affected in a claim, however not his own. The insurance company would then possibly try and sue the policy holder for their losses. So technically hes still driving round insured.
The DVLA encourages it, look at their prices of vanity plates and see how they increase when there’s the slightest chance of a number being used as a letter.
Insurance would be invalid.