I would buy a cheap set of plates and some velcro and keep them in the car at all times.

Some cops will look on this that you knew you were illegal, and others will let you off if you change them.

Basically you're fooked either way. You will get stopped a lot though for them.

My mate used to get stopped for small plates all the time, and eventually the cops just took them off him. Then radio'd the traffic cops while he was in the car, telling them to look out for a grey RS Turbo driving towards his house with no plates on.

Evil cunts!