hi there buddy, THANKS and congrats to you too!
No I received the approval letter and in there it has the contact details for my local county register (Dorchester). I called them and once I mentioned my name they said "yep we got your certificate yesterday already and you will be posted a letter for invitation on the next available group ceremony". It will not be until 8th Feb 2018 but I am in no rush anyway so all good!
Maybe just give your register a call? They might have your stuff too and it's only a matter to get them to tell you what date they could offer you.
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Just to update I got my Invitation letter as well today dated 1st December 2017 from UKVI.
booked ceremony for 13th December 2017