[holding answer 24 April 2007]: The Department’s bilateral arrangements cover routine flights by military aircraft from the relevant countries transiting UK airspace and landing in the UK. They also apply to other state aircraft landing at UK military airfields on routine business. These arrangements do not provide any form of immunity from customs and immigration procedures, national or international law, or regulations covering safe use of UK airspace. Action would be taken by the appropriate authority with MOD support should illegal activity be detected.