However, the add-on does best the performance of the original World of Warcraft by some considerable margin, around 4-1, whilst the original itself enjoys a sales lift, jumping from number 40 to number 28.
Elsewhere in the chart, last week’s first and second best-sellers, Capcom’s Xbox 360 shooter Lost Planet: Extreme Condition and Nintendo’s Wario Ware: Smooth Moves, hold on to become this week’s second and third.
The UK’s favourite football duo also slip one place each, with EA’s FIFA 07 and Konami’s Pro Evolution Soccer 6 occupying fourth and fifth respectively.
Sega’s World Snooker Championship 2007 enjoys a very strong second week in the charts, jumping from number 17 to number six, whilst EA’s Need for Speed: Carbon occupies its lowest position since its release last year, settling for seventh place.
The remainder of the top ten comprises Activision’s Call of Duty 3 in eighth, EA’s The Sims 2 Pets in ninth and Rockstar’s Canis Canem Edit at number ten.
There’s also a noticeable presence from a number of budget PC titles thanks to some aggressive price-cutting on the High Street. Grab It’s Sega Rally claims 27th whilst GSP duo Puppy Luv and Sonic Mega Collection Plus claim 31st and 36th respectively.