tesco clubcard wine loophole

Salad

I never go to tesco so don't know how just good this is, but it sounds a good way to get some wine very very cheap if not free:
http://forums.moneysavingexpert.com/showthread.html?t=1782525

P_Air

I've got a Tesco Clubcard, but I've no idea how you trade the points in?

Reckon I could hammer 6+ bottles of vin quite easily in this heat