Sainsbury's Nectar Card users issued warning as supermarket is named one of most expensive
![Sainsbury's Nectar Card users issued warning as supermarket is named one of most expensive](https://i2-prod.walesonline.co.uk/news/uk-news/article29512123.ece/ALTERNATES/s615/0_sainsburys-shoppers-using-a-nectar-card-have-been-warned.jpg)
Sainsbury's Nectar Card users have been issued a warning as the supermarket has been named one of the most expensive in the UK, according to the latest price comparisons