Number plate cloning is a problem, but many of the people who do it aren't the sharpest tools in the shed.
You would have to clone a number plate from an almost identical car (same make, model, colour, etc.) in order not to raise any suspicions.
In many areas of the country there are police forces with ANPR on their patrol cars, and you can bet they'll pull over a car over a mismatch. Most probably quite aggressively, on the presumption that other criminality is involved (e.g. the car is stolen, has been used in bilking of petrol, etc.)
With sufficient processing power, they could hamper this by tracking the region that each number is. If a plate pops up over the other side of town too quickly, or fails to pass through intermediate sectors, it could raise a flag.
You would have to clone a number plate from an almost identical car (same make, model, colour, etc.) in order not to raise any suspicions.
In many areas of the country there are police forces with ANPR on their patrol cars, and you can bet they'll pull over a car over a mismatch. Most probably quite aggressively, on the presumption that other criminality is involved (e.g. the car is stolen, has been used in bilking of petrol, etc.)