Rig
GamebaseCPCFullV27 contains only original games.
AmstradMania is a collection of many copied games.
GameBase is the frontend.
You must download gamebase-setup-v1.3-full.exe and install it on c/gamebase.
Run GBToolbox.exe and create an "Amstrad CPC" database.
Move all the extracted folders to c/gamebase.
Run gamebase.exe if it doesn't work, you need to point to the folders in your collection.
Similarly, you can create the "AmstradMania" database, then you have two AMSTRAD databases,
in the same frontend.
https://sourceforge.net/projects/gamebase/files/gamebase/v1.3/ (https://sourceforge.net/projects/gamebase/files/gamebase/v1.3/)
Thanks for the advice - much appreciated :D