Went into my local tesco extra - Portsmouth - near Marriot Hotel.
I went to print a couple of 6"x4" instant photo's expecting to pay 30p each at the touch screen kiosk. There was a poster in the foyer advertising 10 instant photo's for 10p - a penny each. You have to pay with a credit card and the T+C state 1 deal per person. Only needed a few prints so got 10, didn't try a different credit card to get more, so probably would work.
The instant photo's are dye-sub prints, just as good as a lab and will last just as long as a lab photo, they tend to be stronger as well
The machine or posted didn't state when the offer finishes
Go late at night when its quiet and print some rude ones!!!