Archives Hub - UK archive guide search
Historians and genealogists take note: If your research takes you across the pond, or if you're already in the United Kingdom, this database might be a great next step.
The Archives Hub has aggregated archival finding guides to primary source materials from almost 200 institutions across England, Scotland, and Wales. The collections represented by these guides include records from individual churches and personal papers (much like our own archival holdings), as well as materials from every discipline from Anthropology to Zoology.
The Archives Hub isn't a digital repository, so you will need to follow the links in any interesting records you find to the collections' holding institutions in order to inquire about getting copies or visiting in person. However, it does provide a much more specific search than a generic search engine that returns results from the entire internet.