The Tesco Wine Festival is back, and over 50 wines are half price right now from Tesco Wine by the case.
The best deal I can find is a savings of £39 per case on a case of Freixenet Extra Vintage Brut Rosado, case of 6 - works out to £6.50 per bottle. Regularly priced £78, down to £39. Great deal. I'm not sure how long this is going to last, but I'm thinking you probably want to get in before the stock goes.