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@...>