Assuming he stayed in England/Wales, then possible deaths would be -
JAS 1933 St Olave - Richard Barry age 58
JAS 1935 Dartford - Richard Barry age 60
JFM 1974 Croydon - Richard Barry age 94 dob 1st Ap 1876
JAS 1940 Poplar - Richard Barry age 73
JFM 1926 Cardiff - Richard M Barry age 49
JFM 1930 Cardiff - Richard Barry age 52
OND 1942 Tonbridge - Richard Barry age 64
JFM 1958 Wallasey - Richard H Barry age 80
AMJ 1945 Mythyr Tydfil - Richard J Barry age 67
Can we rule any of those out?
ADDED - we can rule out the 1958 Wallasey I think. He left a will, he is Richard Hubert Barry, and executor is widow Margaret.