I got some tea bags in a shop this morning and although marked £3 on the shelf they went through at £1.
I went back and stocked up as the bbe is April 2019.
doubt national as I don't often see this kind of thing with asda (more usually tesco) but could be worth keeping an eye...
The barcode is
5 060123 600087
but if you are near galashiels they had loads of these!