Our public library had an Acorn Electron for anyone to use : I have spent many free afternoons there until my parents doubled up my savings ( at age 12 ) and I bought my own.
Around the same time I entered high school and they had a full classroom full of networked BBC Micros!
Going from a BBC Master to an Acorn Archimedes 310 at the College I was working in then was like going from an Apple ][ to a Mac.
Archimedes 310s(?) were in use for medical graphics applications (expanded RAM and I think I recall they had floating point units of some kind). There was also a parametric CAD application that was used by Lucas(?) for a bit. The music software Sibelius was released first on this platform having been coded in assembler by the brothers Finn for speed.
The subsequent financial and ownership history of the ARM processor design isn't as inspiring I'm afraid.
Around the same time I entered high school and they had a full classroom full of networked BBC Micros!
*whoami
As gadders mentioned : she should be knighted.