The two people who I have contacted so far have given me names (one of them knew my Dad) and the latest one gave me the name of my mother's uncle and cousin so I know they are definitely related.
I did join an ancestry website (Friends Reunited), and I found a cousin, whom I didn't previously know of, plus I rediscovered another cousin (whom I hadn't seen for many years), both of them in the UK. After delving deep into my family's past, however, the names that I found were of strangers, whom I could not find any interest in, so that was that.