A few people people have told me recently to look out for how larger packs don't always represent best price per unit in the supermarkets
Here is some sharp practice by Tesco
Bold Liquitabs (Detergent sachets)
12 £3.88 = £0.323 per sachet
20 £6.86 = £0.343 per sachet
- not special offers these are side by side normal shelf edge prices
Rip off Britain
Customer Service girl just shrugged her shoulders and gave an inane grin when I pointed it out