Hi MaxD
I am going to have another look at the family tree. Granny's name was Davies before she was married, but she was Welsh not Irish.
The reason I think it was the 1938 time frame as this postcard was in my mum and dad's possession for as long as I can remember.
He left London about 1939, moving to Cheshire with the company he worked for.
I assumed it was in his possession at that time, however, I could be wrong, perhaps it came into his possession later, perhaps in the war years when my mother visited his family, who knows. Perhaps it was a convenient piece of paper on which to write the address, or the address was written on the back of the photo so my dad could keep in touch with a brother?
I am going to try and send a photo for you to look at the address to see if I have made an error. Unfortunately, the last one I tried did not send.
But thanks for all the information