The Ad Mascot Wiki

Geoff's Car is a red Mazda car released in 1998. It is only seen in the PG Tips driving lesson advert from 1999-2001

The car is often driven by his daughter, Samantha, who her favourite colour is actually blue 

At the end of one of the variants in 1999, The car starts moving by itself as Samantha asks Geoff A What? 

It also appears in the first PG Tips advert from 1999 where Geoff is voiced by Russ Abbot, who narrates the british children's series Dream Street, which also appears in 1999. His voice sounds like PC Nod Off