UPDATE; THIS HAS PROBABLY EXPIRED NOW UNLESS YOU HAVE A METRO OR EXPRESS NEAR YOU, ALTHOUGH THERE ARE SUGGESTIONS ON MSE THAT THESE OFFERS ARE BEING EXTENDED INTO NEXT WEEK...
Half price at £2.98 a bottle. In Store only.
Not available for Grocery home delivery for some reason (it is full price on website), nor is it on Tesco Wine.
Offer finishes today and only started on Thursday or Friday as far as I can tell.
Makes Tesco Finest Cava cheaper than their 'normal' stuff which is £4 or 3 for £10.
Seems to be limited stock as well - I wanted to stock up, but the 12 on the shelf (at 10.00am!!) were all they had left in my local Tesco.