Multiple versions (might) exist - Version 1.02 (June 1990) exists, which suggests other versions might also exist.
The game comes with the following copyright notice embedded in one of the Basic files:
"(c) 1990 FORMAT Publications. All Rights Reserved. ANYONE FOUND WITH A COPY OF THIS PROGRAM THAT IS NOT A FORMAT ORIGINAL WILL BE DELT [sic] WITH TO THE FULL EXTENT OF THE LAW. YOU HAVE BEEN WARNED - DO NOT COPY THIS DISC OR ELSE"