In reply to Tilly, no. The Rhos Post Office was originally at the end of the short cul de sac to the right of the Cayley pub on the prom. Not sure what is there now, despite the fact that I drive past there twice a day every day. Probably keeping my eyes on the traffic around the pedestrian crossing.
For many years after the P.O.moved there was still a telephone kiosk in this little entry. It was left behind after the move. It was common prewar practice to have a phone box outside a post office.
The P.O. moved to approx two doors to the right of the present cafe Ninos or Dinos? It was on two levels, half way inside you went up around 4/5 steps to reach the counter.
At another later date, probably in the 1970s it moved again to its present position. I am a bit vague about this because at that time I lived in Rhyl and did not see much of Rhos. But it apparently moved next door, one further step towards Penrhyn Avenue. Seems unlikely, but I suppose there must have been some advantage. Maybe it gave them further depth.
By now they must be close to Charlies fresh fish shop, or maybe in it. If Charlie was still alive he would be around 130 years old. When I get a chance and spot a vacant parking space close I will have a better look from across the road which should help my memory of seventy plus years ago. If so I will post it on the forum.