2017 update - I got this machine in 2006 after an extended drive to the Wirral, and the first 3 pictures here are from then. Look at the lack of discolouration compared to now. Proof if any were needed that these plastics will eat themselves over time, something that the original designers would never have anticipated. These days there is a process called Retr0brite which is largely Hydrogen Peroxide based that can restore the plastic to its original colour. Might have a go with this one here.