Tesco have loads of special offers on currently, and they are REALLY bad setting limits (like 'Not to be used in conjunction with any other offer, or Frozen only etc.)
In the Frozen Pizza section there is a deal, 3(specific) pizzas for £4 ... However the specifications are not very specific :-D (Tesco Pizza 310g-408g).
The oddety is simple, they also sell fresh (not frozen) pizzas, and many fit the same not very specifics, especially many of the Stone Baked and Pan Baked ones, that are normally £3 each, so 3 would normally cost £9, but with £1 off, each, 3 currently would only cost £6, but using their full encompassing 3 for £4 deal in the main pic we can do better :-D
More pics of extra pizzas, inadvertently added into the deal, shall be added into comments.
If enough #Heat happens on this thread, I'll share another where you can get £115 worth of goods from Tesco for only £1.50, by just following the limitations of another deal they have nationally ;)