P.1127
Experimental V/STOL fighter, two prototypes and four development aircraft.

Kestrel FGA.1
Aircraft for the tripartite evaluation squadron, nine built, six later transferred to the United States where they were designated XV-6A.
P.1127 (RAF)
Development V/STOL ground attack and reconnaissance fighter, six built as pre-production evaluation aircraft before the type was ordered into production as the Harrier GR.1.
First aircraft flew from Dunsfold on 31 August 1966.

XV-6A
United States military designation for the six Kestrel FGA.1 transferred to the U.S.
VZ-12
U.S. Army designation for two P.1127 development aircraft, not delivered.
P.1127
Experimental V/STOL fighter, two prototypes and four development aircraft.
Kestrel FGA.1
Aircraft for the tripartite evaluation squadron, nine built, six later transferred to the United States where they were designated XV-6A.
P.1127 (RAF)
Development V/STOL ground attack and reconnaissance fighter, six built as pre-production evaluation aircraft before the type was ordered into production as the Harrier GR.1. First aircraft flew from Dunsfold on 31 August 1966.
XV-6A
United States military designation for the six Kestrel FGA.1 transferred to the U.S.
VZ-12
U.S. Army designation for two P.1127 development aircraft, not delivered.
Hawker Siddeley P.1127