About Football Manager

The disk label says "Exclusively distributed by Prism Leisure Corporation PLC Copyright 1988".
But I wonder who really programmed this version, because Prism Leisure is a company who often re-releases games (I wish I had the box and/or the manual). Perhaps it was Addictive who also did the second game, but I'm not sure. And I couldn't find anything about this first "Football Manager" for Amiga anywhere in the Internet (only FM 2 and FM World Cup Edition). And what disturbs me even more is that when I start the game it says "Copyright 1990 Prism Leisure plc". But this would mean it was released AFTER Football Manager 2! Hmmm...I really think I got a re-release of this game. If someone knows better then please correct the publisher and copyright information.
Edit: HOL confirms a 1990 release of Football Manager, being released 2 years after the sequel.