Upavon
Upavon is on Salisbury Plain, so sounds as though he was in a military camp there. As has been asked, what is the occupation on the marriage certificate, and I suppose I have to ask where the wedding was, as usually it was in the bride's church, or was it a civil wedding? I suppose you could describe the whole huge area was one military encampment at the time, so he could either have been still in the Army at the time or had been demobbed and stayed locally.
I believe that next-of-kin can seek details of censuses, which may mean that it has to be a child or with the authoruty of a child. If that is the case and you have the authority duly signed, the Office of National Statistics may allow a search and provide details of occupation and residence in 1951, 1961, etc. However, you may not need to do so if you know the birth dates of all children: you could search for and obtain birth certificates and that will state residence/occupation of father.
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