If you remove a council or police wheel clamp it is an offence. However , if it was clamped on private land and you remove it without damaging it and just leave it there there's nothing they can do. I've done that in the past a couple of times. Deflate the tyre which loosens it ,slide the wheel brace behind the loosened plate and remove the nuts and then the wheel. It'll easily then come off . Replace with the spare.