Originally Posted by
Whirlygig
Daft question from daft bint - how can they police it?
Only a guess but:
A Silverstone callsign is only allocated if there is a corresponding signature on the 'I've attended the briefing' sheet.
IIRC, Special Branch/Silverstone need passenger manifests for each flight (including the pilot's name.) These names could then be cross checked against the 'I've attended the briefing' sheet.