Just got this reply from the Llandudno and Conway Facebook group about Edwin Artiss of 4 Raddlebarn Rd's death, might be of interest.
Adrian Hughes Admin
I did a guided walk around that area a couple of years ago and told this story. The shaft doesn’t seem to be marked on the map but it is close to the water tower behind Gloddaeth Hall (now known as St David’s College). The school uses the shaft for potholing practice. This was the story as I researched it:
“When Llandudno got mains water in the 1870s, the well was no longer used and covered over but not sealed. In 1922, 6 boys were playing in the old well and had descended down it on ropes. In the water they came across a floating object that turned out to be the badly decomposing body of a man. Naturally, the kids hastened out of the well as quickly as they could and alerted the police who removed the body. His clothes had disintegrated to pulp and he was beyond all recognition.
The police had a real mystery on their hands and at first thought it might be that of a Welsh minister who disappeared and was last seen in Gloddaeth Woods. However, the body was later identified as that of Edwin Artiss of Birmingham who disappeared in 1917 while staying at the Tyn y Coed convalescent home. Although how he ended up down the well was never established.”