Hi Suz,
I am such an idiot. Thanks for those!! I'll have a look to see if they appear in any of the census returns!
I think I may have them in 1881 at 77 Napier St, Burton Upon Trent, Stafford, England
Josaiah BOSWELL Lodger (Head) M M 35 Derby, Derby, England Cutler & Grinder
Eldry BOSWELL Wife M F 30 Longton, Stafford, England Dressmaker
Edward BOSWELL Son M 8 Derby, Derby, England Scholar
Deonah BOSWELL Daur F 3 Derby, Derby, England Scholar
I think that it might be the correct family as Algar had a sister called Diona and a brother called Isaiah.
Can't seem to find anything else on the family though, although I do have a birth reg entry in the March Qtr of 1846 in the Chesterfield District in Derbyshire for Josiah Boswell.
Dominic