Ok so for the past six weeks ago I have thought I was going slightly mad as I've been locked out of checking out an order before my slot has closed. Meaning I've ended up with a useless order and a trip around the supermarket with three kids (which no one wants).
Ocado call center guy has now admitted to me that they regularly close slots early "due to demand" ie well before the cut off time set out in my booking email or text message.
I don't know whether I am most angry about this at a time when people are relying on online supermarkets or just the fact that they have made me feel as if I was incompetent when I called and had just imagined it.
Anyway, fair warning - don't take the cut off time as gospel or expect them to admit cutting customers off early.