Sorry to be a Nerd!!!!!!, but I think this answers the question
ICAO Article 3
The ICAO convention does not apply to State A/C, see the attached extract below. If anybody wants to trawl through Aip Gen 1.7 (UK differences 56pages ) to find somethig different please tell us all!
Article 3
Civil and state aircraft
a) This Convention shall be applicable only to civil aircraft, and shall not be applicable to state aircraft.
b) Aircraft used in military, customs and police services shall be deemed to he state aircraft.
c) No state aircraft of a contracting State shall fly over the territory of another State or land thereon without authorization by special agreement or otherwise, and in accordance with the terms thereof.
d) The contracting States undertake, when issuing regulations for their state aircraft, that they will have due regard for the safety of navigation of civil aircraft.
So watch out on the A1 for the Old Bill in your 6 o'clock in a Harrier GR7
(if any are servicable)
Cheers ***
Also See Cap 393 (2006 version )ANO Article 152 para 4 (if you can understand the legal patter )
