I bought a Chidley baritone a number of years ago but Barleycorn didn't know the maker. I opened it up just the other day and found the following stamped inside:
135 High Holborn
Doing some research I found this web site:
https://www.scatesconcertinas.com/pdf/ROCK CHIDLEY Concertina Maker.pdf
And this: http://www.concertinas.org.uk/others.htm#Chidley
Mine is a 48 key and octave lower than my Wheatstone treble or tenor (not sure of the difference). It's not a fast player but has a nice sound and was fully restored with new bellows.
I would appreciate any comments,