Tesco boss Dave Lewis in shock departure bbc.com

Tesco's chief executive Dave Lewis is to leave next year after leading a turnaround plan for Britain's biggest supermarket chain.

In a move that surprised analysts, Mr Lewis – who took the helm in 2011 – said the decision was "personal".

Ken Murphy, who has held senior positions at the owner of chemist chain Boots, will replace him.

The departure was announced as Tesco reported a 6.7% rise in first-half profits to £494m.

Tesco chairman John Allan said he had accepted Mr Lewis' resignation with "regret" and said the chief executive intended to leave "in the summer of 2020".