Excellent game(s) and for such a small price + Free UK Delivery, this is a steal.
5 Games, One Box: The Orange Box is the ultimate collection of innovative action games for the PC or console, and an amazing introduction to the Half-Life series for console gamers.
The Orange Box delivers five innovative action games from Valve - creators of the blockbuster Half Life franchise, in one box. The Orange Box includes Half-Life 2: Episode Two, Portal and Team Fortress 2 in addition to full versions of award-winning Half-Life 2 and Half-Life 2: Episode One for an engrossing first-person action experience.
There were one or two other online sites that are selling it for about 50p cheaper, but they looked a bit dodgy, whereas Base.com are legit.