Hi Sue I've been in touch with Bob who posted the original request before and we have exchanged some information (I didn't immediately realise this). I have linked Henry through William & Phillis and then to William and Elizabeth Haskell through the parish registers for Harbridge (I have them on fiche) and this also gives 6 of the 7 siblings of Henry as well as henry of course (Betty 21 Mar 1807; John 30 Oct 1808; Thomas 4 Nov 1810; William 4 Oct 1812; George 19 Dec 1814; Henry 22 Aug 1817; James 23 Jul 1820). The first 4 children's baptisms are recorded on the IGI but the later ones don't seem to be. The 8th sibling Josiah c 26 NOv 1824 is also from the IGI (Cranborne). The descendants of Henry and Mary Norton arethen primarily from Bob, though I have added some additional data where I have found it, as you say there seems to be only one child from the marriage, presumably because Mary seems to have died before 1851, but as you say no record of her deaath is apparent.
You can find most of this information, along with a lot of other Hayter information on my web site at www.vectisjon.com