Hi Rosie,
Thanks for this.
I've found this which is similar but slightly different:
I have on the Holy Trinity, Coventry CD...
Marriage
8th Mar 1815 by licence
William Stanley batchelor of St Luke, London, Middx (minor with consent of Stephen Stanley) and Mary Gardner spinster of this parish (with consent of John Gardner)
witnesses John Gardner, Harriett Gardner, and Stephen Stanley
If he was born in 1806 then he'd definitely be a minor in 1815.
There's a few other records though of a Stephen Stanley (ribbon manufacturer) with a son William in 1794 but I'm not sure they're the same person as I found death records for William in 1847 aged 41 and confirming him as a publican at Swanswell Tavern.