Currently the Sun newspaper and Morrisons are running a promotion. It is for £5 off a £30 shop instore (not including petrol, cashback, pharmacy, and 1 or 2 others, check t & c's in paper).
TESCO ARE ACCEPTING THESE!
It started on 19th and runs until the 24th may. The voucher given on the 19th was for next week, the 20th was for the following week, the 21st for the one after that and so on, so today's is for 5 weeks times, and tomorrows is to be used in 6 weeks time.