Even if you insist on using real hardware, emulators are useful for preparing and testing software for running on the real thing.
http://www.mkw.me.uk/beebem/
Up to RISC OS 3.11 (3.19 is German 3.11)
http://b-em.bbcmicro.com/arculator/
RISC OS 3.50 onwards. Acorn A7000
http://www.marutan.net/rpcemu/index.php