The problem is that it's not up to HM Customs and Excise to designate airports for the Terrorism Act 2000. There seem to be two possibilities:
1) Shoreham has been added to the list by an amendment to the TA 2000
2) HM C&E has made a mistake in producing their list.
If the latter turns out to be the case, guess who goes to jail. Is it:
A) A Customs Officer; or
B) The Pilot-in-Command
?