That's because your new insurance had not yet been recorded on the MID. You can check at www.askmid.co.uk . I had better warn any readers driving uninsured that their chances of getting picked up in a roadside ANPR check are increasing. A lot of police resources are being thrown at this, with the backing of insurers who are concurrently making insurance increasingly expensive, especially for younger people. Also, many policies that used to cover a policyholder to drive other uninsured cars no longer include this cover.