I did my ‘big shop’ at Waitrose and M&S – here’s who came out on top

It’s shopping trolleys at dawn for Britain’s most aspirational supermarkets. Marks & Spencer – traditionally an also-ran in the grocery league table – has been chipping away at Waitrose’s customer base, so that last month for the first time the two drew neck and neck, claiming 3.8 per cent of the market each.