Head of State callsign?

[forget]

Does BA use an equivalent of Air Force One when flying HM around?

[Not Long Now]

No. (filler to make up to 10 characters)

[DogfighterF22]

RAF Northolt?

Does "The Royal Flight" at Northolt not fly HM about?

[Spiro]

Yes, and will be doing for some time to come as the gershon report was long on myths and short on truth

PS "Royal flight" ceased to exist in 1995 - now 32(The Royal) Sqn

[nomorethanbablue]

Although the Queen and PM will share use of the two new aircraft, supposedly set to be delivered towards the end of this year - the so-called "Blair Force One" http://news.bbc.co.uk/1/hi/uk_politics/5098126.stm. Who know though whether the Broon will go along with such a scheme...

[A Very Civil Pilot]

I believe that the a/c the PM uses is due to be registered as G-ORDN.