Ursa: I was saved the animated Norton... I had the subtitles "on", and they overlay any such annoying coming-next message. On the plus side, I was so engrossed I hadn't realised how far into the episode it was and assumed some clumsy vision mixer had pushed the button by mistake.
I was so annoyed by this intrusive and unnecessary advertising, which, coming where it did, really upset the suspense for me, that I've sent a complaint to the BBC about it. I'll post the response I get, if any.