Rosie is correct, if you want to find positive information on William, obtaining his marriage 1947 certificate for his fathers name, it is an important first step and his age at marriage gained from himself. Death age, can be wrong (out a few years) on death certificates because the age information comes from an informant ! who may not know or have access to exact records of his age or just guess from limited knowledge they know of the deceased. (Word of mouth info gained from William as an old man with a poor memory before death or not exactly so sure relative)
Likely a register office wedding by 1947
Once you have William's dads name you can start refining your search of the censuses for the family of William 1871c to 1911c
There is the faint possibility that the marriage 1947 of a William, may be another much younger William (hence need the 1947 marriage certificate for his age) being a different William to the death William age 82 in 1952 considering that William would be aged 77 at marriage 1947
Its all to vague, without census info post 1911 to 1952 like we have pre 1911 .
Most parish registers are held at the church by 1947/1952 just a few held in archives
There could be service forces records, medical or tax records or newspapers of William or electoral registers in libraries being that late in archives 1940/50's or if you can find his national insurance, tax or medical numbers, pension OAP number or post WW2 ration book numbers
