Always glad to help. If you come across anything else, make sure to share.

Using the newspapers.com site there were several references in the 1880s-1910s of a "T. W. Armstrong" singing in England, some of which were in the London area, but I was unable to figure out what Tommy's middle name was.

I don't recall the exact details, but I do remember one being singing for a Christmas service. If that sounds right I could look into that further for you.