I am working on a theory that the two John Willetts on BCC 1849 are the same. One the father of John Willetts who married Emmie Baker and the other's father Elijah Willett married to Ruth.
Free reg give a baptism for John Willetts 14th may 1848 at St Martins Tipton father Elijah miner and mother Ruth, abode the workhouse. On BCC has Elijah living with other miners at the Whitehouse Tipton. One of the transcripts could be wrong.
Also Northfield Road, Netherton, Old Hill connection. Elijah, John etc. etc.