While on the tesco website I came across a page which says that all 4 packs of lucozade are BOGOF, and showing the half price price.
This means you get 8 bottles for as little as £1.43
To make sure they honour the price only buy a maximum of 6 packs per flavour, as I found out that tesco officially have a maximum special offer of 6 per item, and can refuse to give the special offer price.
As far as I can see it should be honoured as it is clear on expiry dates and everything.
Hope it works for everyone!