This might help explain where the Fisher/Hall brothers/Froggatt comes in (I think I added this to the end of the timeline, but will just repost the relevant bit here). I think the first part is from an Ancestry tree which has no sources given, but the last part is from lookups by a rootschatter/s (apologies I cannot recall who

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A family tree on Ancestry has:
Mary J Fisher - parents George and Harriett - born in Ilkeston, Derbyshire 1862
sister Harriett born 1874 (no sources given)
Mary J married brothers -
Samual Hall 1858 to 1891 and
Arthur Hall born 1869 Riddings, Derbyshire. Samual and Arthur's father is William, mother is Ann Froggatt.
The father William, was a labourer in an iron works on 1871 census. Can this tie in with his occupation given on James Hall and Harriet Fisher married in 1895, his father is William. What is his occupation? James Hall also claimed at his trial that when he marriet Mary Ann's mother he worked at the Stanton Ironworks Company.
In 1881 William is still working as an Ironworks labourer as are his sons. There is no sign of a James Hall with his family. William was born in Leicester, the family lived in Derby. All these places tie in with where James Hall is said to have been tramping.I think it could be useful to contact any small local family history groups and newspapers in the area once you receive the certificates. You might find something on the families at local level. They may have some archived material (which may not be online - I see the Ilkeston Local History Society link seems to focus on the prominent people) which may give you more clues (not necessarily even about the case, but about the families in general). It may be a good excuse for you to take a holiday there Carol.

Alternatively there may be rootschatters who live locally who would be willing to chase this up for you if you wish.
But first, the certificates.

[PS. I can't rmember who asked, but Belper was mentioned in relation to Ann Froggatt - the place was swarming with Froggatts - I have some in my tree

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