I am ever conscious of being seen as a pushy, aggressive American. But a carpenter was supposed to show up at 9 this morning and so far, no show and no phone call. I'm happy to wait an hour before getting annoyed -- traffic was hideous yesterday due to the tube strike, and maybe there's some overflow into today.
That said, how soon is too soon to call to ask if the person is turning up? Is an hour late too soon? That's what I'd have waited back in the US before calling, but I just want to make sure that's not seen as too soon here.