Some slip through the net. My BIL spent two years driving untaxed as he thought he had a direct debit. Only found otherwise when he visited me and got clamped for no tax. No fines other than the charge for unclamping (also had to prove it was taxed within ten days or something).
Apparently she hasn't paid tax on her school run panzer
https://twitter.com/commuteer_ahoy/status/1449692024886677517?s=20