2 for £5 applies to the larger 750ml Orchard Fruits and Forest Fruits flavours. Works out at 33.3p per 100ml.
I bought 6 of these last night for £15 in-store at my local Asda. Deal also applies online!
N.B. Tesco has a simliar offer - 3 for £10 if you don't live close to an Asda, but not as great a deal because it works out at 44.4p per 100ml
Offer due to expire at Adsa on 12/04/2010. The Tesco lesser offer of 3 for £10 expires on 28/03/2010.