If you’ve seen that Lambeth marriage record (bride was Sarah Harper) you will know that his father was listed as John Fryer, boot maker. Both bride and groom were said to be living in East St at the time of the marriage. The 1841 census date was 6 June, so only a week or so before the marriage.
Was the father definitely listed as a boot maker? In the transcription I saw (a few years ago) his occupation was a mason.
I can't find an 1841 census with John and Sarah in East Street. The nearest possibility (very loose though!) I have seen is an 1841 census listing a John Fryer age 25 (so born 1816 - 1820) in New Broad Steet, St Botolph Without Bishopsgate in the household of Micholls family, so presumably a servant. I can't find Sarah Harper in 1841 census or the father John Fryar. It would be nice to find them all listed together in East Street!
Is this possibly John Fryer in 1861 with a different wife. Occupation the same as 1851 census. When his daughter Catherine married in 1860 to Charles Hills, John is not recorded as deceased.
https://www.familysearch.org/ark:/61903/1:1:Q2ML-3GXQ
It's possible, but the census lists his birthplace as Lindsey, Middlesex. Is this near Strand?
there is a John Fryer, waiter, 44, born London, in the 1861 census in Doby Court, St Olave Silver Street, with much younger wife Mary. He is possibly the John Fryer, waiter, who was awarded a medal by the Royal Humane Society in August 1861 for saving the life of Harmond Clayton.
For John to have remarried by 1861, Sarah would have to have died between 1851 and 1861. I can't find any suitable death for her on the GRO. Are there any other details on the life saving incident?