Hello, Karen,
I had a quick look at the complete Birth indexes for the name of Clifford Davies for 1947 & found that there were 16 entries throughout the country. I felt this was perhaps a bit daunting for anyone not used to searching the indexes as, altho' the spouse's maiden is shown, the christian name isn't. The next step, after finding the one you think is the right one, is to cross reference, by entering the spouse's maiden name for the quarter of the year, ie 1947. Then looking down the list for that surname, you should find the husband's surname shown, together with the same distict, volumn number & page no.
I saw that one entry for Clifford Davies was for Islington & I knew there was an All Saints Church there, so I checked the cross reference for the district Islington, Sept. quarter of the year & the spouse's maiden name & I found.
Clifford Davies = Bertha RAWDING
Sept. ¼ 1947 Islington vol no 5c page 2615
It is possible to order certificates online quoting the details shown above at the followng site.
http://www.gro.gov.uk/gro/content/certificates/Good luck
Meliora