Thanks guys
I said I'd add some info as I went along... these aren't my words by the way
In May 1975 Hawker Siddeley received a contract to proceed with airframe development and an order for 24 Sea Harrier FRS.Mk 1s was announced. The designation indicating the triple roles of Fighter, Reconnaissance and Strike. A further ten were ordered later, bringing the total to 34. The first Sea Harrier FRS.Mk 1 (XZ450
) made its maiden flight at Dunsfold on 20 August 1978, followed by three pre-production aircraft fitted with test instrumentation for development flying (XZ438-XZ440). Deliveries to RNAS Yeovilton began on 18 June 1979 with XZ451 being the first to join the Intensive Flying Trials Unit (IFTU), No.700A Squadron.
At the end of March 1980 the Royal Navy Sea Harrier IFTU was redesignated No.899 Sqn, becoming a Headquarters Squadron performing operational training duties, and at the same time No.800 Sqn, the first operational squadron, was formed. No.800 Sqn served briefly on HMS Invincible before transferring to HMS Hermes, an old anti-submarine/command carrier. In January 1981 a second operational unit, No.801 Sqn was commissioned to serve aboard the Invincible.
On 2 April 1982 the military dictatorship in Argentina launched an invasion of the Falkland Islands. Three days later a British carrier battle group sailed from Portsmouth, with a total of twenty Sea Harriers aboard Invincible and Hermes. Whilst on the way, a cache of the latest all-aspect version of the Sidewinder air-air missile, the AIM-9L, was obtained from the USA and flown out to the carriers. The Falkland Islands lay within 600 miles (966 km) of three major Argentinian airbases and the Sea Harriers would thus be vital in protecting the fleet from enemy air attack. The conflict opened in earnest for the Sea Harriers on 1 May with dawn air attacks on the occupied airfields at Port Stanley and Goose Green. No aircraft were lost. That afternoon Flt Lt Paul Barton of No.801 Sqn (an RAF pilot on an exchange tour) shot down a Mirage 5 with an AIM-9L, scoring the first kill of the conflict and the first for the Sea Harrier. The limited number of fighters available could not provide a complete defensive screen, but the extremely high serviceability of the aircraft, often flying in conditions which would have grounded conventional aircraft, severely disrupted enemy air operations. Over the 7 week campaign the Sea Harriers achieved 23 air-air kills in air-air combat for no loss. During the entire war, only two Sea Harriers were lost to ground fire and five more to flying accidents.