The deal is in place until 2014, starting with The Restaurant Show 2012 on 8-10 October at Earls Court 2.
Adam Jones, chief executive of Showplans, said: "We have built a strong brand over the years based on the quality of our technical showplans, and we are dedicated to maintaining the high level of quality our customers have become used to. The exclusive deal with William Reed is one of a number of such contracts that we have entered into recently, and we are proud to provide our services to such an established event organiser."
Showplans is also launching a new interactive visitor planning tool called Showplanner later in the year.
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