Hi James
Welcome to the forums as well
I could be wrong but I think Andy Davison was experimenting with the game lemmings before he came up with the idea of worms. Maybe the Scorched earth games gave him inspiration as well.
I'm a worms fan as well, the game is great. I used to play the game at the weekends with my dad, I usually gave my dad the advantage in this one by his eight worms against me and the computer, we had four worms each. Usually the person who teams up with the computer gave you a sort of disadvantage.
Did you manage to complete the PSP lemmings?