I’ll precede Jem in mentioning Malo Carvou and Adrianne Greenbaum… 
I think that in general those of the Period Instrument/Historically Informed Performance persuasion who play early-mid C19th repertory tend to use period flutes. After all, there are plenty of them extant, unlike true Baroque traversi, so there is not the demand on makers from that quarter that there is for Baroque flutes and for flutes for ITM. Also there is not as yet quite such a tendency to play mid-Romantic material in period style as there is for Baroque and Classical era music. Besides, when the Period specialists do venture to, say Verdi (e.g. John Elliot Gardiner’s recording of the Verdi Req), Bohm flutes were already in use and are perfectly “authentic”. Not much point as a “period” specialist in using repros when originals (in more or less any pitch standard and design variation you might want) are there to be had (though maybe at a cost)… the quantity of good quality, playable survivals from the C17th-C18th is rather less, so there is a point (and a market) in reproductions. It is probably a mid-way situation for Classical era (e.g. 4-key) flutes - quite a lot of survivals, but also something of a market in repros.
Lorenzo, so far as I know Adrianne uses period simple system flutes. Her (modern) wooden Bohm flute is a Powell. Dunno about Malo Carvou - is he a classical player at all??? I think Brian Berryman, like Chris Norman, uses originals too.
Back to Shane’s query; no, I don’t think that what we would recognise as “folk” or traditional music was what amateur C19th players mostly played (though obviously there were folk musicians out there playing these instruments too). Sure, classicalised arrangements of traditional material (like Nicholson’s) were very popular, but so were the instrumental equivalents of parlour songs and most especially arrangements and sets of variations on popular music of the time, e.g. opera arias etc. As I said before, the thing to do would be to have a look at sheet music from the period, or at the catalogues of music publishers. This stuff was the equivalent of modern day “singles” recordings and the printing of sheet music for those singles.
Pedantry…
Splitting hairs just bores the t*ts off me
yes…wellllll…precisely why you’d never make it in my business, where precision is paramount.
no worries…jest havin a larf. 
assuredly, i’ll be the first to quote your little song should any of you slip.
it’s almost as if Andrew’s never left us.
Jem, I believe he asked for anything other than “celtic” trad music on simple system flutes (I missed the “made by modern maker” part), not only classical music. Malo and Adrianne fall into this category…
And just what business might that be?
Rob
[Note: Thread Revival. - Mod]
can anyone tell me more about the flutes made by Jonathan Fentum (1723-1884), and later his son Jonathan fentum, and then his son after that Jonathan fentum, i am aware that by the time of Arthur fentum (my two times great grandfather) the flute business was non existent. i am aware that the first Jonathan Fentum was a member of Londons music society, does anyone know what that means and entails? and does anyone know any more about the quality of the flutes made by my six times great grandfather J fentum the first.
Thanks
Hi Bradley - welcome here. I’m afraid I can’t really help you very much - certainly not on such specific Qs as you have posed. I’ve handled several Fentum flutes, both H(enry) and J(onathan), but probably all middle period, 1830s-50s by their style. I’d say they are consistently decent quality instruments, very playable once restored, but that’s about all I can say. I imagine you’ve followed the links up-thread to the research I did on the Eastes Cambridge connection (or will do so), and I’ve nothing to add to that. You can see more pictures of 3 Fentum flutes in my Facebook albums - feel free to link up with me there.
Hi Bradley
Just checking - are you familiar with the entries for the various Fentums in the New Langwill Index? Not a lot of detail, but maybe a starting point.
Terry
Bradley, the recent poster, may wish to view this thread on Fentum, containing the relevant Langwill entry, and other info about Fentums.
https://forums.chiffandfipple.com/t/calling-all-photos-of-fentums/73236/1
Kevin Krell