Nah, they didn't make computers. Back in the 80s the BBC had a TV series on home computers, and they wanted an "official" machine for people to follow along at home with. So they put out a spec, Acorn Computers (the people responsible for the ARM chip used in pretty much every mobile phone and similar nowadays) met it well with their upcoming Acorn Proton (successor of the Acorn Atom) and it was renamed the BBC Microcomputer.