Hello, and thanks for replying!
I have Ancestry too, but it turns out knowing where to look is half the battle!
I am after a John Fitzpatrick, yes, but there are a few in the area at the time, so I'm currently trying to eliminate them one-by-one. I had found the Death Record of a JF listing the Henrietta Street address, but that's inconclusive for me at the moment (he seems to be there on the 1821/1831 census, and now also at least 1821/1824 on the Land Tax). I was looking for confirmation of the number of other residents in the house there (sadly, a substantial number, as per Jennifer's post), as he married in 1830 and their (seemingly) only child was born in 1832.
The family disappear from the current indexes of the 1841 census (so I'm looking at trawling the streets manually), but as both wife and child turn up on the 1851 census (and subsequently) as servant and housekeeper at different houses in London, I'm working on the theory that JF died between 1831 and 1851 and trying to build a picture based on that.
The other JF at Great Portland Street is also of interest. Fingers crossed he was a son who moved out of Henrietta Street in 1827 to his own pad, just before getting married at the church at the bottom of the road...
All good fun theorising. Hope to find some solid evidence! :)