Supermarket sales in the UK fell below £100bn for the first time in six years due to price wars and competition from discount retailers, though a weaker pound may benefit international businesses. Nisa is reviving its popular 'bank holiday bonanza' to boost sales, while retailers like The Fragrance Shop and Spar are innovating with one-hour delivery slots and weekly deals. Asda is struggling with its worst quarterly performance on record, prompting urgent measures to improve shopper perceptions and footfall.