Missing out any material fact to your insurers would result in the policy being deemed void. Perfect, as insurance companies don't really like to pay out most of the time.
Being stopped by a regular response officer means you probably go undetected as an uninsured driver. It would be a different story I'd imagine if a traffic cop gets a whiff of anything suspicious.
I guarantee you'd get found out if you have an accident.
If you get stopped at the side of the road for no insurance - for example here in Sussex, it's likely to result in an FPN for 6 points & a £200 fine. Plus, your car will most likely be seized, and you'll have to pay a sizeable chunk of money to eventually get it back.
Insurance companies don't like uninsured drivers. It's only a spiral down towards disqualifaction....