So I went into the office by the front door for a change on Wednesday, and Lily on reception called me over to let me know the person I'd given the old toaster away to had never collected it from reception, so I've brought it home again. Ocado have said they'll take the new one away even without the box, which is great. On a whim this evening I made two slices of toast, one in each, and though the new toaster has a slightly bigger slot they both came out equally uneven and equally not quite toasted to the edge. Far better to keep the existing slightly rubbish toaster than pay £30 for a new one. Shame it's taken 4 weeks and so much faff to discover!
Still tempted by the see through Magimix one mind :)