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These undertakings were given under the monopoly provisions of the Fair Trading Act 1973.They require the National House Building Council (NHBC) not to amend some of its rules of membership without the CMA’s consent. Consent is needed where the amendment leads to non- or lesser compliance with the recommendations set out in paragraphs 8.90 to 8.102 of the Monopolies and Mergers Commission’s 1990 report on the supply of structural warranty services in relation to new homes.