Just adding food for thought...but ( sadly) nothing to the finds on the thread...(well done, BTW)
(I do hope you can eventually find solid proof of Jane's ancestry, Ken!)
On first reading of this thread I agreed with bbart etal who said pianoforte-tuner was likely bogus.
Especially after finding a blind man on a workhouse census who said he was a piano tuner...
although, of course, his work could have snapped something into his eyes.
But then I found some earlier blind tuners...some who did it on their own, some with partners.
If someone only had a good tuning ear, but no mechanical skills, they'd ALSO need a partner.
I've also changed my mind somewhat, after having read some online articles:
Exposing the London Piano Industry Workforce (c1765-1914)
Says labourers were worked hard, paid little, and laid off immediately if/when the market faltered.
This would explain why some may not have been enumerated as being in the trade.
They employed leather-workers, cabinet makers, carpenters and lathe turners
hatters, hosiers, silk weavers, linen drapers, stationers, builders, bricklayers
furriers and curriers; watchmakers; locksmiths, coal merchants, artists & more
https://repository.londonmet.ac.uk/7399/1/603079_Vol1.pdfThe proximity of piano makers, within blocks of their home...makes me wonder...
Did the family joke about it or actually have some involvement within the trade?
William Cooper piano maker - 101 Dean Street, Soho, London -1839
bottom of page 318 to top of page 319 lists Thomas Thomkison
& other Piano forte makers betw. 62 to 77 Dean St. early half of 1800s
https://repository.londonmet.ac.uk/7399/2/603079_Vol2.pdfNote: church in which they married-St. Anne is now "55 DEAN St, London"
MAP - with Soho streets (some have new names) mentioned in this thread
https://maps.app.goo.gl/FkbM97gFyXtmxLer7Little Compton Street on map 1868, intersecting with Crown St. & Dean St.
https://greatwen.com/wp-content/uploads/2013/11/map1868.jpgAn old map of Soho
https://greatwen.com/wp-content/uploads/2013/11/map1868.jpg BTW, A William Cox of Crown St was on the first "burial board" of London 1854
PETTITT AND COX, 22 & 23 FRITH ST & 50 OLD COMPTON ST
a Circulating Library & Stationery business that later added a printing office
https://archive.org/stream/twocenturiesofso00cardiala/twocenturiesofso00cardiala_djvu.txt