Hi,
I can tell you for almost certain that you are all barking up the wrong tree as far as Thomas Bowbrick and Sarah Charman are concerned - there must be another Thomas and Sarah along the way somewhere, or the records are incorrect.
I can see where you are all coming from though because of this record.

and this record of Thomas Bowbrick marrying Sarah Charman in Cranley, Surrey.

However I think due to the Surrey accent many scriveners had difficulty spelling Bowbrick and came up with kinds of spellings like Bubrick, Bubberick etc...
Thomas Bowbrick and Sarah Charman did in fact have have a Henry Bowbrick(Buberick) but not a Henry John Bowbrick - born in Cranley in 1804 as per this record

They also had 6 other children, William (1801), Thomas (1807), Hannah (1810), Sarah (1812), George (1815) and Harriett (1818) all born in Cranley, Surrey as per my tree
here. I very much doubt that they would have had another Henry in 1815 but please do put me right if you have other evidence.
I do hope you are correct as I can find no evidence of my Henry Bowbrick Marrying or having children so my tree stops there on this line.
I live in Cranleigh (Cranley) and know the area well, I also frequently visit the Woking Family history centre - where all the Surrey records are kept - so if anyone needs anything checked out I am more than happy to do so.