There’s an excellent book, A Computer Called Leo, by Georgina Ferry:
And I see there’s a preservation society, credited in the video:
The LEO Computers Society (which has charitable status) started life as a reunion society for people who worked on these remarkable machines. Its principal mission now is to ensure that LEO’s heritage is preserved, protected and - importantly - promoted to wider audiences.
Edit: and a mini-site at the CCH is also associated with the society:
Welcome to LEO, the first business computer