Hi thanks for the reply.
Yes I have thought of the possibility he is still alive, however I feel this is unlikely for a couple of reasons.
1) He was looked for for a long time, right up until the late 90's, I know this does not mean he isn't alive but it would make it less likely
2) The most important thing was his health, I know he was involved in an accident in the late 40's early 50's which saw him spend some time in the water and he was very ill after this, the last picture I have of him is from approx 1958 when he was 43 and he could be mistaken for someone in their 60's and looked quite ill.
I do not know he emigrated I just have not ruled it out as I have been unable to find a death here, he had 7 Brother and Sister all of whom went to Canada or the USA except on of them so I felt he may have gone looking for them, however I have been unable to find evidence of this either.