Got a bit further and it's getting interesting.
Joseph Rogers was not Joseph Rogers as he was Joseph Edwards on his marriage certificate. I found him marrying Dorothy Waltho in St Albans January 12, 1924, aged 31 and he says he's living in Cudworth and working as a Leading Shunter. Was he born in 1892 or 1893?
They then have three children that I have found on BMD and also their baptism records and all are named Edwards.
I also have his death certificate and there are actually two records (same reference) and the one I got says, Joseph Rogers otherwise Joseph Edwards. I imagine the other one says the same. The witness is J.W Rogers, his son. Hmmmm. It says he was born around 1893.
I have the birth certificate of George Edwards (my late father-in-law) and I also have his marriage certificate from 1951 and he's George Rogers.
On reading I find that anyone can call themselves anything but not on a legal document but it appears that summat happened in order for all the kids to be Rogers later in life.
What do you think of this mystery?