Yes, definitely cellars of houses, many of which were rather elegant and grand. At one time, they were mainly occupied by medical professionals, probably those working at the Children's Hospital.
I have done a bit today on this street. I got diverted once again from the Villa Tavern : https://www.midlandspubs.co.uk/birmingham/islington-row/
Cheers, Kieron
Kieron the pub in the pic is on the corner of Tennant St and Islington Row in your link
I'm confused by your message Williamstreeter. Are you referring to the pic in Post #1 from Lyn? That is the White Swan. The pub on the corner of Tennant Street was the Anchor Inn.