Ultravox’ first single off the sixth album called Quartet, released in 1982. The previous three albums had been produced by German producer Conny Plank. When asked about it, singer Midge Ure said: It was getting a bit safe. We knew if we recorded with him again it would be great and we’d be really happy. But there would be no excitement.
So the band turned to George Martin, the so called fifth Beatle. He accepted the job because his daughter was a fan of the band. The decision was seen as a move to safer, more commercial waters, even though it was not intended to be. For the later album U-Vox they did return to Plank.
To be honest, I don’t hear the difference, but I’m only an occasional listener to Ultravox.