Lockstone joined Merlin in September 2001 after a three-year stint at banking group Alliance & Leicester. He had previously spent two years as head of European PR at PricewaterhouseCoopers' tax and legal services arm. He was NatWest UK head of PR between 1993 and 1996.
The departure of Lockstone, who had options at Merlin, leaves the firm with five directors.
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