More impressive when you think that they get bashed around at low level. which is hardly what a bizjet was designed for.
They have outlived their bases at RAF Stradishall and RAF Finningley, and I think that some were based at RAF Manby once upon a time. Yes they have paid for themselves many times over, but cant be the most fuel efficeient or quietest beasties around nowadays.
The first example, XS709, first flew in December 1964; deliveries to the RAF commenced in 1965 and it entered service in December 1965.