Hello again,
I have been digging around a little bit more and there were a lot of Rosier's in Mendlesham.
I found the blacksmith listed again in my original copy of White's 1855 still working in Langham. I checked on him as I wondered whether he could be your James' father?
In 1851 he is age 63 years and was born in Mendlesham
His wife Sarah was born in Langham and they had son Henry age 26 living at home and working with dad as a Journeyman blacksmith
there was a visitor Caroline Sawyer age 20/26 born Langham.
The only James I could find in Walsham-le-Willows in 1841 was
James Rosier
Gun Maker 29 years
Elizabeth wife 28 years
James son age 6 years
George son 3 years
Thomas son 2 years
Ann daughter three months
Jeremiah Orams 16 years Gun Makers Apprentice
Eliza Baker 12 years Servant
In 1841 James and Sarah are smithing in Langham with sons Henry 15 and David 12.
Gun Makers were often apprenticed to gun makers in London such as Purdy's.
There is a problem in that at some time an incumbent at St Mary the Virgin in Mendlesham has refused permission for the LDS to film the records, so you would have to see if there is anyone going along to any branch of the SRO who would be willing to carry out a look up for you. The PRs are from 1558-1900 on 33 fiche.
Langham St George are filmed and run from 1561-1900 on just 9 fiche
Walsham le Willows St Mary are 'awkward' - they are available at the SRO from 1539-1900 on 14 fiche and one film (1539-1856) there is also a transcript 1539-1900. It is possible that some of these have been filmed and others not filmed when it is a combination of fiche and film.
I have just been through my White's again and found that in Walsham there was a watch, clock and gun maker - William Last. Wonder if he was master of James when apprenticed?
all best wishes, SM ...
PS I took a couple of photographs in Mendlesham a couple of weeks ago when I was at SLHC meeting - I have to return at the end of this month for our AGM. The Church was covered in scaffolding but you can see it at
www.suffolkchurches.co.uk