The move follows initial 'chats' with agencies revealed in PRWeek last month (PRWeek, 13 January).
Standard Life head of media relations Scott White said an agency would be appointed with the proviso that Standard Life's members agreed to a flotation at a special general meeting, which is expected to take place in May or June.
Brunswick relinquished the brief in December 2004 after four years.
Standard Life's listing could value the company at more than £4bn.
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