This was my third attmept against the AI on expert level, I did beat the AI second time around but they were playing as Portugual so I don't really count that ;)
I lost to the AI playing against the Russians and Germans. I played the Brits for my third attempt; I used Spanish seeing as they are my highest level civ for single player. Still that is only level 9 though so my deck is pretty basic.
However this was the first game that I used the 600 gold card, it enabled me to FF and take the centre of the map. I drove him back and kept him pinned down. The AI sent out streams of men but their attacks were much less than they were compared with the other games, they ddin't really make use of their economic advantage that they had over me.
Anyway enjoy the game, this might* help those who are struggling to beat an expert AI.