This is another of my blasts from the past involving the Spectrum. In those days you had to use a keyboard and type in the instructions in the magazine for the game to run. This took 3-4 hours of serious bashing on the keyboard and then try to understand why it didn't work. This is one of those games that almost worked...
The title of this game also has a clue to where the geo is hidden (not the name of the builder)
The location has the owners permission, all 40 of them!!; it is not right in their face and can be safely collected from the pavement without any trespass.