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"A contractor isn't the same as outsourcing."

CBRE are a little vague as to what they do. It seems to come down to "advising" but it certainly doesn't sound like electrical contracting. Maybe they were overseeing electrical contractors. See their site at http://www.cbre.co.uk/uk-en/services/global_corporate_services/data_centre_solutions where they claim "With Data Centres, knowledge is power".