Originally Posted by
stiknruda
who insists that if I fly my N reg to Jersey from sunny Norfolk, I can dispense with the SB clearance
It's nonsense. 12 hours notification to the police is required (unless departing from a designated airport) regardless of the aircraft nationality.
But perhaps more relevant, you need customs to go to/from Jersey. That requires a Customs & Excise Airport or (usually) 24 hours notice at a GA concession airport.