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Yes, presuming the external demise changed. You can move things around inside all you like and they don't care.
Our buyer's conveyancing solicitor was great (we now recommend her to people, not our own...) and possibly less good conveyancers wouldn't have spotted it, but not a risk I'd want to take given the very small cost of submitting updated plans to the Land Registry.
Also this was a shared freehold flat, if it was freehold house I'm not sure it would matter (but I don't think I'll take the chance now we own one and are planning to extend).
13, 14, wow
We had a side extension done over 10 years ago, should we have updated Land Registry? Never occurred to us.