Well, the new answerphone was working last night - it appears to be dead now when I phone from work. But I was looking for something in the corner where it plugs in before I left for work, it's possible that I knocked the plug loose or something. But to quote H. Solo esq. "I have a bad feeling about this"
Later And it's very dead. Oh well, back to Argos tomorrow, I suppose I'll go for the BT one instead.