Many local pay & display car parks are now installing machines that force you to add your registration number to the ticket so that you cannot pass any unused time on to another parker. I think this is a bloody liberty! If I have paid for 2 hours parking and unexpectedly get back after only an hour, I should get a refund if I'm not permitted to pass on the ticket. Apart from boycotting these places, I'd love to know if there's another way to get my own back.