There were 1,028 Henwoods listed on this new site for 1851 on the census.
76 Henwoods lived in Hampshire. Out of them, 30 were Henry Henwood.
I checked on a Henry born 1808 and was 43 years old. He was a servant working as a footman. I found him again on the 1861 census but the information was off a few years. This shows how you must be flexible with dates a little and how professions matter as well as places born and living in.
PS: Wednesday 9/16/09 at 11:25am. I was just contacted by researcher Valerie that this Henry Henwood belongs to her family as well as the other listing at King Souborne.