I am an unashamed fan of there British Aircraft Corporation TSR2, my favourite aircraft ever! Its graceful and beautiful lines should have dominated British military operations from the late 1960s through to at least the early 2000s, and if ever there was a British-built military aircraft that could have been successful on the export market then this was it. Designed to replace the highly successful English Electric Canberra in the tactical strike and reconnaissance role (including nuclear strike), the TSR2 was built to a highly exacting specification including the ability to operate from rough landing areas strips (see this You Tube clip to get an impression of the difficulties developing the landing gear to allow such a complex aircraft to do this - https://www.youtube.com/watch?v=n96V2RkaXqE).
Capable of Mach 2 powered by its two Bristol Siddeley Olympus jet engines and with the range to strike deep into enemy territory, the platform featured much brand new technology and it was the cost of this (with a much prolonged development period) that was to lead to its demise, it being cancelled in 1965 by the then Labour Government of Harold Wilson. Much of the technology went on to famous success however, for example a development of the terrain following radar designed for the TSR2 being used on the Panavia Tornado.
Here I envisage what the TSR2 might have looked like in service using modified 1/48 Airfix kits - from right to left a TSR2 GR.1 with iron bombs, a TSR2 GR.4 operating in Iraq in the 1990s, and a TSR2 F.2 as a replacement for the English Electric Lightning (and equipped with Redtop IR air-to-air missiles from an Airfix Lightning and scratch-built longer range Red Deans). Also in picture as a What If, the aircraft ordered to replace the TSR2, the General Dynamics F-111K (itself cancelled later by the UK) and a final replacement option, the Dassault Mirage IV (again never to see RAF service). Note the WE177 tactical nuclear weapon carried by the latter.