List school sponsors / academy trusts comprehensively

[RichardTaylor]

We could seek to list "school sponsors" comprehensively.

example of a "school sponsor"

https://www.get-information-schools.service.gov.uk/Groups/Group/Details/5002#details

school_sponsor would be a good tag, it's slightly broader perhaps than academy_trust.

There are 5685 "establishment groups"

https://www.get-information-schools.service.gov.uk/Groups/Search?SelectedTab=Groups&b=1&b=4&search-by=all&searchtype=GroupAll