Just learned that because the Archives' Kew Gardens facility is closed, they have decided to make parts of their holdings available online.
Main website: https://www.nationalarchives.gov.uk/
Info about online access: https://www.nationalarchives.gov.uk/about/news/digital-downloads/
They still are able to answer questions by email and live chat, and are still processing Freedom of Information requests.
Happy Hunting, Nancy S. Maryland, USA <summ1@...>