Yup only GT4s come in custard unless was bespoke paint- it was probably John....he goes by 'Harry Potter' on the OC....top bloke - dab hand at changing wheels
+1 - but take advice on the plugs - they're not due until 54k - see what they look like
the search button is your friend http://www.350z-uk.com/forum/viewtopic.php?f=64&t=32277