Nostalgia may not be what it used to be, but Data General (UK) Ltd seems to believe that it has therapeutic powers: on the Advantage West building adjacent to its base in Brentford, Middlesex is a vast captionless poster of everyone’s favourite children’s television role model John Noakes and his faithful companion Shep – action man Noakes certainly left viewers with the impression that anything was possible, but the image from the carefree 1970s is likely simply to evoke a yearning for a simpler time when if computer companies worked hard and played hard, profitable growth and success would effortlessly follow as the Magic Roundabout followed Blue Peter…