That's (on Steam)

£1.74 for Company Of Heroes (2 armies, American campaign)
£2.49 for Opposing Fronts (2 new armies + 2 new campaigns)
£2.49 for Tales Of Valor (3 new short campaigns, few new units, more game modes)

£3.74 for Company Of Heroes Gold (Vanilla + Opposing Fronts)
£7.49 for Complete pack (everything)

I'd recommend the gold pack, Tales Of Valor isn't really worth it, and with gold you get 3 full campaigns, and all 4 armies in multiplayer, for £3.74. You'd be stupid not to buy it at that price.