Hi everyone
Many thanks for all your help - I thought I'd let you know that I think I've resolved the differences between "my" Henry WEBB and tmisty's Henry Charles WEBB (we have had some off-line correspondence).
I spent a bit of time looking for another Henry who could be the one who married Hannah Stubbs in 1810, but I haven't found any obvious candidates in Great Brington. However I did find them in the 1851 Census in Titchmarsh, and also found Henry in the 1861 Census at the same place (when he appeared to have remarried). In both those census returns his birthplace is listed as Denford, Northampton. As this is where his wife was born, and where he married, this seems plausible. I looked up FreeReg and found the baptism of a Henry, son of Henry and Ann Webb, in Denford on 14 June 1789. That fits in with the census info, where birth years tend to move around a bit.
I'm pretty sure the Henry Webb who was born in Great Brington in 1791 belongs to my line, as I believe the family farm passed to him from his father, and then down to his son George who subsequently emigrated to Australia.
I've just had a look at a large scale Atlas and think I have discovered where all the confusion may have arisen. Denford is very close to Titchmarsh, which in turn is only about 7 kms (as the crow flies) from Brington. Great Brington, on the other hand, is about 50 kms away.
So I think this strongly suggests that the Henry of Great Brington born in 1791 is mine, and the Henry of Denford (near Brington) born in 1789 is tmisty's.
Hopefully further research will provide more evidence to support this.
Once again - thanks for the assistance
Linda