John Martin BIROM and Elizabeth Crosley THARPE
married 5 June 1845, by licence
at St Mark's, Kennington Park Road, Lambeth
He was (of course) a surgeon at the time.
He stated that his father was called JOHN BIROM
but gave no information about his father's 'rank or profession' so we don't know whether JMB's father was alive at the time, or what his occupation was.
Susan Hirom was supposedly a widow as early as 1820 but did not name the father of her two sons when they were baptised.
It remains to be seen whether 'John Birom' was JMB's father.
JMB may have been illegitimate and may therefore have invented a name for his father in 1845.
NB1: I had difficulty in tracking down the image of the marriage record on Ancestry because the surname had been indexed as BIRON.
NB2: And yes, JMB was actually born in Emsworth, Hampshire. He gave that as his birthplace in a couple of Census records.