article_snippet: Across the 'big four' supermarkets – Tesco, Sainsbury's, Asda and Morrisons –
article_snippet: However, Mars and Ferrero eggs are up by 4.2 and 4.1 per cent respectively.
article_snippet: And Thorntons' have stayed the same price on average.
article_snippet: But Tesco upped the competition on these core lines last week, slashing Tesco price from £1.50 to 75p.'
highlights_snippet: Nestle ones - such as Smarties and KitKat - are also down by 4.2% .
  