The move, which takes effect on 1 January, follows recently announced organisation changes that create four divisions.
In his new role, Mr Carter will be responsible for the all four divisions as well as a wider group of central functions, including IT and customer development, as deputy to chief executive Geoff Cooper.
Chairman Robert Walker said: "This promotion recognises the outstanding part that John has played, and continues to play, in the success of our business. He is a first class senior executive and we look forward to his contribution to the future development of the group.鈥�
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