The Groceries Code Adjudicator has said he is weighing up the cost and resources required for an investigation into online giant Amazon, compared with more informal action to improve the way it deals ...

Amazon is facing an official investigation by the UK's grocery watchdog over its treatment of suppliers. The investigation will particularly look at the brand’s payment practices.

Amazon does not break out figures for its UK grocery sales, so its designation under the code publicly confirms for the first time that its sales have crossed the 1 billion pound threshold.