well techny when u get that rev check it tell u what yr model it is
anything between 10-100km is consider new and will hold complete value of brand new price
anything from 101-10000km is consider ex demo will hold 90% of value
if it a clearance sale of old model but no body change, it'll only hold 85%
then from 10-100km it'll hold 85%
from 101-10000km it'll hold 70% value of current models prices
but likewise there guideline from redbook, there nothing wrong with you finding a solicitor after you sign it, there is a 3day cooling period by law unless private sale, so if u think u got rip off or might of brought the wrong thing, you got 3days to check it