The Porsche Regs state:
"The standing start will be preceded by a Green Flag Lap but, for shorter tracks (including Brands Hatch (Indy layout), Silverstone (National layout), and
Knockhill), there shall be two Green Flag Laps."
The BTCC Regs state:
"After completion of the countdown sequence, competitors will undertake two Green Flag Laps at circuits where the track distance is less than 1.5 miles (Brands Hatch Indy and Knockhill). At all other circuits, competitors will only undertake one Green Flag lap"
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