Quite correct Quiggs. Once incident is referred to Chris Draper & John Lawson Reay's book "Llandudno through time" (2010). There is a photo on page 94 showing Trinity Church surrounded by water on 30th October 1932. They say "with high winds and stormy weather, as early as 9 am the tide had reached the promenade steps, by 10 am it was washing over the parade and by noon the wind was driving huge waves onto both north and west shores sending rivers of water into town and creating a huge lake around Trinity Church". I am sure I remember something similar but on a smaller scale in the 60s which affected Gloddaeth Avenue perhaps someone else recalls this. On page 71, John also has a photo showing stones up to the level there are now but this must have been 4 years ago.
From what I have seen some folk now seem to deny there was ever any tidal flooding - though I did see parts of Craig y Don flooded in 1990 which coincided with the Towyn flood but never received the same media coverage.