The proposed merger between supermarket giant Tesco and wholesaler Booker is to be subjected to an in-depth probe, UK competition authorities said today.

The Competition and Markets Authority (CMA) says there are ‘concerns’ over the proposed £3.7bn deal.

The CMA said there are 350 areas where there is an overlap between Tesco shops and Booker-supplied independent stores.

The CMA does not identify the areas in question, but it is thought that East Anglia, Wales, and the South East would be most affected. CMA said the deal could be bad for shoppers in those areas because of reduced competition.

The CMA said that if the deal…