In practice - no one will. But if you get into an accident(especially if anyone is harmed) you can absolutely be sure that the police will check if your ebike w

In practice - no one will. But if you get into an accident(especially if anyone is harmed) you can absolutely be sure that the police will check if your ebike was legal at the time or not. If they find you had a motor more powerful than allowed, or that it could ride without pedalling, you will find yourself in a situation where you caused an accident riding an illegaly modified vehicle - and will most likely be found at fault regardless of anything else. And that's not a good position to be in.