Yep, Martin's idea would be cool I reckon. I'm always wary of bands who re-unite. If they get back together and write new material, that's great but if they do it just to play all the stuff they did 20 years ago or whatever, then I always suspect it's just a money making exercise and a 'give them what they want' tour. I was never lucky enough to see Ultravox in the John Foxx era, although I did see them twice with wee Jimmy on vocals, but I wouldn't want to see them now re-hashing Young Savage and Hiroshima Mon Amour.
John and Louis do some great renditions of the Ultravox stuff, especially Slow Motion and The Man Who Dies Every Day, so a John / Louis / Billy / Robin line up would work well, especially if they put their heads together and wrote some new material. But, as Harry Hill might say, what are the chances of that happening?
ΤΏΤ
P.S. Maybe somebody should start a Bands Reunited website!