I have an allocated parking space where I live with my number painted on but I don't have a car so I rarely use it. However if I have guests coming, or I've rented a car, sometimes it's being used as if it were a free parking space. Technically it's a piece of land I own, so I'm not being unreasonable. How would ypu respond?I don't like confrontation, but does a polite note on the windscreen sound ok?