Alas this time came to an end, and Acorn disappeared, but their legacy lived on. RiscOS carried on, supported by various companies.
I had mostly forgotten about it until now. An old colleague recently mentioned that in 2006 a group of ex-Acornites started a new company, RiscOS Open Limited (ROOL), dedicated to maintaining the operating system and take it forward. The OS is still available, and supported. So do take a look, and if you have an interest in RiscOS then do consider helping them out.