He will be replaced by John Gill (pictured), the company's current chief operation officer (COO).
In a statement, HSS said: "Under John's leadership the Company's strategy will continue to focus on the successful roll out of the new style local branches and the development of the Company's pioneering logistics and distribution network, including the opening of the National Distribution Centre in the first half of 2016 as announced at the interim results in August."
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The company floated the London Stock Exchange earlier this year and made a pre-tax loss of £14.1m in the first six months of 2015.
Chairman of HSS, Alan Peterson, said: "John's record and strong leadership skills as both CFO and COO have ensured that he has been a central part of the Board's thinking on succession planning for some time. John has been closely involved in developing and implementing the Group's distribution and logistics strategy and is ideally placed to lead the rebasing of our cost structure and make improvements to operating margin. I'm confident that he will make the step-up to the Chief Executive role quickly and effectively."
(LM/MH)
