Just popped over to Asda in Telford town centre and noticed that they had packs of Toffifee containing 15 pieces for sale at 64p, reduced from £1.28.
The price wasn't shown as a rollback and was printed on a white ticket. I guess they've loads of stock from Christmas that they want to shift.
I'd guess that the offer is instore only unless anyone who uses Asda online can correct me. The end date for the deal is unknown also but I've put it as the end of this month as I had to enter a date.