this is such a bad idea on so many levels.
A guy I work with had his car siezed about a year ago.
The traffic plod were doing ramdon spot checks at the bottom of the road we work on.
The guy I work with was stopped and the vehicle was found to have had a different engine in. The car was siezed and put on a huge articulated trailer they had at the side of the road and he was done for no insurance aswell.

Lesson learnt the hard way.
It only takes something silly to be found out.