equalityforall:
Maybe that was a vintage period for this wine, ie 2005/6 season?
Dunno what year Tesco's stock is from.
The Tesco is 2007, so maybe we should cellar it for a couple of years and it will quadruple in value!
Seriously though I think its a misprice as a google search shows that tesco were previously selling this at £39.84 a case. It looks like they took the 50% off twice so these are effectively 75% off.
Great spot OP