I am on the number 3 milk now and in the first half a dozen tubs I got I found a £1 off the 1-2yr old milk on top of the foil - in the last few tubs it hasn't been there. Do these vouchers only appear every so often?? Got a great at asda last week as they had the 1-2 yr old milk on offer and was also able to use my stock of £1 off vouchers, bringing each tub down to £5.50!!!