Solution by the author. Simon Avery, played on the Amstrad CPC

Get Staff, Get Backpack, Examine Backpack, Get Map, South, West, North, West, Hit Demon, Drop Staff, East, South, East, East, South, East, Read Map, South, In, Up, Examine Bed, Get Hat, Say Home.

South, West, North, West, West, North, North, Give Hat, Get Brownie, South, South, East, East, South, East, East, South, East, Read Map, North, In, Up, North, Say Doom

South, Down, South, East, East, North, Give Brownie, North, North, Kill Monster, North, West, West, Talk Eberneezum, West, West, North, West, West, Sneeze, West, West, North, West, South, West, South, West, West, North, Talk Tree, Talk Tree, Climb Tree, Get Book, Say Home.
Game over.