Originally, the firm refused to negotiate a voluntary recognition agreement with the union, despite more than half of its staff being members.
Amicus head of organising Bernard Rutter said: “This case should have been settled without a hearing given the high level of membership.
“We hope the company will now work with Amicus to negotiate a proper recognition agreement.”
The CAC awarded recognition without a ballot and both parties are due to meet before 21 May 2007.
Gask & Hawley declined to comment on the ruling.
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