WebJunkie: I bought both Baldur's Gate I & II previously and just added the series to my basket to see what the price was but the series price is now showing £11.18, before it was showing £9.08??? Anyway, when I added the series it showed £4.18 (which is correct as the each game shows £2.09) so there's still some error with displaying series pricing!
HunchBluntley: Did you go to the checkout page? The correct price will generally show there, regardless of whatever price it might show in your basket, on the game page, on the front page, etc.
I did go to the checkout, it showed correct, but the issue is some people may not add it to their basket because of the pricing error, this nearly made me not buy it until I saw the price of each game was £2.09, not what the series pricing showed!
Moot point now that I've bought them though, but, The Settlers series pricing is spot on though :)