valuations

I've actually done a search for this but can't come across much information that answers my questions. I have done a valuation of a car that i am currently interested in getting. Its fully standard "Y" reg, Ibiza Cupra 1.8T 20v in Onvi Yellow with 46k on the clock. Now "Whatcar.co.uk" claim...

As I'm considering selling my TFSi Sport I went to Glass' website to get a valuation. Turns out they have a bug at the moment which means if you select that your car has metallic paint it cannot quote. I did a valuation omitting the paint but INCLUDING Sat Nav / Bluetooth / 6xCD / Spare wheel...