Was in my local Sainsbury using a self service till and I notice the voucher printer at side was printing off money off voucher.
£2 off £20 spend
£3 off £30 spend
I may have also saw a £4 off £40 spend.
All valid till 05/03/2010.
In all fairness most customers were just leaving the vouchers behind so you could just spend a quid and tear off a spare voucher. :)
Not sure how many stores are giving out these vouchers.
of course the discount voucher is only of value if you are likely to save money in first place. BOGOF and half price offers are on the products you want. I suspect Tesco would match these vouchers anyway.