Reference the "gaping hole in Gatwick security", if I understand the issue, the initial problem was the failure of the catering company to carry out their security checks and seal the vehicle. The driver colluded in this scam and Gatwick security were presented with a vehicle that appeared to comply with the regulations.
The posts, and newspaper reports, that require Airport Security to be tightened imply a requirement for all vehicles to be searched at the access control gates - fine, but consider the time and manpower required to carry this out to everyones satisfaction - under the vehicle, in the cab, the engine compartment, the goods carried, etc etc. Are we all willing to pay for this both financially and in time taken ?
There are usually ways to break most systems if you have enough people coluding together........