Found this 8x pack of Tinned tuna in ASDA after almost buying the current special floating about on here for 4 tins @£3. The 8-pack is exactly the same size tins at 185 grams nett weight or 130 grams drained weight.
So it works out a £1 cheaper for this pack than buying 2 of the £3 packs. I'm sure there are a lot of Tuna sandwich lovers out there, or if not, spoil your cat.
This seems to be instore only.