How do I book a christmas delivery slot with ocado?

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I haven't used Ocado for a long time, so have just re-registered, but can't see how to book a Christmas slot. I know you can, because a friend mentioned it to me, which is what inspired me in the first place.

They're releasing the dates gradually, so if you haven't used the site for a while then you're unlikely to be in the first few waves of invites. I got my invite a couple of days ago but all the slots locally for 24 Dec had already gone, so I assume that I'm not in the first wave either.

I used the e-mail offered to my Mum to get a slot, she shops there once every couple of weeks and she must have got it a couple of weeks ago at least. Even then, the Christmas Eve ones had gone.

Remember that its best to do the shop asap after booking th slot. Last year the system crashed and they had to close down amendments early (i.e. a couple of days before originally advised) because idiots like me hadn't thought it through and thought they would be able to make loads of amendments at the last minute. They may have made changes to allow more flexibility this year, but better safe than a last minute panic in Sainsbury's...