You might be right. BUT At the start the Tesco Computers for schools project was tied exclusively to Acorn Via the BBC Micro. Simply because there were far more of them around in schools when compared to RM 380z and 480. AAnd there were loads of other 8 bit machines .machines Commodore CLC, dragon, Jupiter ace, Newbury, Spectrum, ….. a lot. So to avoid complexity Tesco selected Acorn machines. That went on for a number of years, then Tesco diversified their offering to accommodate those who were not in the Acorn fold.
we had a new LEA “inspector” arrive. His experience was with RM kit. The LEA he moved to was an Acoen stronghold. When a tranch of Government money cam along he decided we should switch to RM. That generated a lot of infighting. Letters from parent to the LEA complaining. His team of advisory teachers and the head of the computing centre at the time were not in favour. The inspector persisted. “MS DOS, is an industry standard, it’s what the children will use in their jobs when they leave school”. That argument won over the elected councillors.
And now, every day, everyone uses ARM based technology.