Oh, how I've waited to use that banner again. Glorious. Anyway, as you may have already guessed, Gamersgate have dropped the price on the Complete Edition of Civilization V just below £12. It beats the next best price by around £5, and is certainly more cost effective than buying all the contents individually.
If you already own Civ V and are looking to just get the expansions, you're in luck - Gamersgate have also dropped the price on Gods & Kings to £4.99 and Brave New World to £6.78. In other words, considering how easy it is to be consumed by the "one more turn" mantra, this could end up being a dangerous deal.