i know this is obvious, but it should have a series II badge (unless the boot has been resprayed or the badge removed by the prev. owner). From memory, Series II S packs came standard with power windows (series 1 didn't), Series two had double-spoked alloys as opposed to the series 1 single-spoked. Also series 2 VTs had the silver strip around the front grill while the series 1 VTs didn't (except the berlina, calais, etc)