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Thanks for that. My wife and I both work so no one would have been home during the week and we never received anything during the weekend, to sign for.
We moved house in the last couple of months, I have checked there and nothing came for me there either. The people who used to live at our address have had their posted re-directed and I have checked with them also (justt in case).
I am the registered keeper, the log book address was updated.
So I guess their argument will be that it was still sent, full stop!