Paula
Here's the baptism you're looking for:
born 6 Aug. 1926, baptised 12 Sept 1926, Frederick John, parent Ethel Prior, (no father listed), Appleford, domestic servant.
I didn't find any reference to the marriage that you referred to.
However, did find the following marriage:
1929, December 25, William John Rouse m Evelyn Phyllis Cheshire (19), father & witness Frederick Cheshire.
No Reginald Cheshire listed in baptisms.
KN