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I was curious about the answer to this so I did some digging. The UK gov digital marketplace does seem to have some interesting leads
I tried some searches:
https://www.digitalmarketplace.service.gov.uk/g-cloud/search?q=facilities management
https://www.digitalmarketplace.service.gov.uk/g-cloud/search?q=estates management&resellingType=not_reseller
It seems there are quite a lot of solutions out there, adding the ‘not reseller’ filter created an interesting snapshot.
My view is that there are consultants out there who have seemingly developed software that is utilised as part of their service, there are some niche pieces of software and quite a number of people offering configuration of the larger solutions you mentioned at the start.
Personally I stopped looking after page 2!