Hundreds of staff will lose their jobs at head office and in stores, with closures starting immediately.
Documents show the secret investigation may have helped wrongly accused postmasters prove their innocence.
Bank of England governor Andrew Bailey tells MPs the UK's economic downturn is "very small".
The price per unit will now be displayed alongside the total price to make it easier to compare deals.
Tate & Lyle's Sugars, which owns the product, claims a new logo will appeal to modern shoppers.