I have been visiting the Bristol Record Office search room to look at the Vaughan collection. As well as looking at the image side of the card, I am also quite intrigued by the message side of the cards. I am feeling more inclined to focus on the postcards messages/reverse side. It feels as though that is an aspect of the postcards that is more hidden, and certainly something to explore more. Understandably (due to time constraints) the Bristol Record Office have not digitised the reverse of the cards, so I think this area is ripe for researching and something to illuminate.
Here is a small selection of some of the messages I have come across so far.