Shrinking shampoo bottles

Unilever's Alberto Balsam have brought out "new" 350ml bottles of shampoo that ASDA sell for the same price (£1) as the previous 400ml bottles, so you now pay the same price for less. What makes it worse is that when they originally replaced the ASDA branded product with the Alberto Balsam equivalent, it had a "same 400ml fill" label despite it being smaller than the 500ml ASDA version.