Compared to the one's that Jays and Craig had fitted to theirs this looks rough as you like also had a visual level gauge, I believe they sourced from Henry so possibly a Simon product ?

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This looks like Craig's car in the Williams induction kit advert.

2009 4/4 Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Connaught Green +8 prev