Newspaper coupons

[jheaton]

I have the 'i' and the Mail, both on prepay coupon.

Recently the local Express store has started getting error messages on one of them - not the same one every time.

Even more recently they've had a till update and now can't put through as plain 'manufacturer's coupon' - if it won't scan they reject it.  Which means I either have to pay twice, or go to another shop - further away.

Anyone come across this and any ideas?  I am getting rather fed up of it, and I suspect, they of me.

Thanks!