Just a data set I'm trying to find.
Ideally with Company & Pension Assets data as well.
Help and ideas much appreciated.
The data exists (privately) in at least one place: The Pensions Regulator, as "The Official Register of Pension Schemes".
Extensive search suggests that it doesn't exist anywhere else, but I thought I'd ask the community anyway.
(too long for a comment)
I didn't look too deeply, but it appears that someone (perhaps you) has requested this information before: https://data.gov.uk/data-request/directory-pension-fundspension-schemes-uk
The given link is broken, but https://eiopa.europa.eu/regulation-supervision/pensions/database-of-pension-plans-and-products-in-the-eea may be helpful, even though the UK is no longer a member of the EU.
Finally, http://www.thepensionsregulator.gov.uk/foi/lists-and-registers.aspx and http://www.thepensionsregulator.gov.uk/en/employers/duties-checker/outcomes/i-am-an-employer-who-has-to-provide-a-pension/choose-a-pension-scheme-or-check-your-existing-one.aspx may or may not be helpful, or you could try emailing them a request?
Not exactly what I was after, and not in a particularly easy format, but this book, "Pension Funds and their Advisers 2016" has proved to be a useful place to start.
(ISBN: 978-1-85783-234-1)