EDIT: You can get even more off the price by using the voucher code GMG20-ODON7-FLUA7 at the checkout. It brings the Gold Edition down to £6.25 and Brave New World to £5.25.
If you've managed to hold off this long for the latest in Sid Meier's classic strategy series, you're in for a bit of a bargain with the sale currently going on at Green Man Gaming. The listing for the Gold Edition will save you around £4 over the next cheapest listing elsewhere.
The Gold Edition includes almost every piece of DLC released to date, including the Gods & Kings expansion, providing plenty of content right off the bat. Although the latest expansion Brave New World isn't in this bundle, GMG have also slashed the price for that to £6.79, meaning you can have a complete Civ V experience for under £15 if you really want to (and probably should, as it's the superior expansion pack.) Thanks to jaystan @ HUKD!