Hewson Consultants LtdFounded by Andrew Hewson and currently owned by 21st Century Software. They also published games under the Rack-it label.
Fantasia DiamondType: Drawn graphics Written 1984 by Kim Topley.
Here is a review of Fantasia Diamond
Quest AdventureType: Drawn graphics Written 1983 by Kim Topley.
Here is a review of Quest Adventure
Adventureland was created by Hans Persson and is now maintained by Stefan Meier.
If you find any errors or have information that is missing, please let me know