Peter Capaldi once supported Spandau Ballet on tour - he was a stand-up; they were desperate to avoid giving the impression they were part of the rock machine by doing something as "industry" as having a band blow them off stage ("support them").
Shapers Of The 80s has the full story, but it was Gary Kemp's passion for Clare Grogan that put Capaldi in the right place to get the gig:
Kemp, himself then 22, recalls vaguely how Capaldi came to his attention at the age of 23: “It was through Gerry MacElhone who managed Altered Images. Maybe he played me a tape, or something.” Clearly he had other more important things on his mind at the time. The point was Grogan had starred in Forsyth’s 1981 cinema smash, Gregory’s Girl, and Spandau’s Diamond tour launched in March 1982 with three dates in Scotland and Capaldi live onstage as the warm-up.Capaldi reckons that it was that slot which got him the role in Local Hero. And that set Capaldi on the road to the TARDIS.
Clare Grogan is at the centre of everything.
[Sidenote: Both Grogan and Capaldi played parents in Skins, closing the circle.]