Hugh, I still cannot find the house in the 1841 Census that looked to me like it was called Piccadilly, but from the other two properties on the same page then it must be near Tyddyn Iolyn which was in the same township of Cefn Y Coed.
I've looked again at the site I found at British History Online and looked at the map on sheet 006 and zoomed in on Tyddyn Iolyn. What I found interesting was that there are four detached properties on that site whereas when I visited it recently I only saw three.
The fourth property would be to the right of the one with the tin roof but now there is just a pile of stones there. At the time of my visit I did wonder what purpose those stones would have been for.
You have done a lot of searching but have you found either William or Elizabeth in the 1891 Census? In the 1891 Census we know that Margaret was living in Glan Conwy and died later that year and that her husband Edward had already died so William might have gone to live with a relative. It's unlikely that William was living with his mother Elizabeth as she wasn't bringing him up according to the 1881 Census so it's still a mystery.
By the way I've looked at the list of William Davies' that you supplied previously and we know your William was the one at No 25 but have you any idea about the ( William Widower) that was mentioned on the form?
Hugo. Firstly, many thanks once again for your research and photos.
As for the 1841 Census, I have attached a summary of all Census images from Cefn Y Coed. I noticed that some properties appeared more than once, including the one that looks like "Piccadilly". I don't know if this will provide any more insight into identifying the property but it is interesting. I did this mainly to provide a snapshot of Edward and Margaret's neighbours in 1841.
I have also been busy capturing all of the information I have relating to my relatives plus putting together Location documents containing your photos, Google Map images, British History Online maps and other information about each location.
Your message has served to remind me about the gaps still to be investigated/resolved. So, I will start trying to locate Elizabeth from 1871 onwards, and William's location in the 1881 Census. The next step will be the Pen Y Groes history. I have tried on a couple of occasions to contact the Nantlle Valley website (
http://www.nantlle.com/history-nantlle-baladeulyn.htm) to have a message posted on their Noticeboard. However, I have yet to receive any response, and I note that the latest message on their Noticeboard is dated 2013.