A discretionary power to approve or withhold approval of packaging under a trade mark licence agreement is subject to an implied limitation requiring the discretion to be exercised honestly, reasonably and in good faith, but a decision to refuse co-branding in order to protect the trade mark owner's commercial interests is within the range of reasonable outcomes. Pre-contractual estoppels cannot qualify the express terms of a comprehensive written agreement containing an entire agreement clause, following Johnson Matthey v A C Rochester. Former Part B trade marks under the Trade Marks Act 1955 that became registered under s 233(1) of the Trade Marks Act 1995 cannot be attacked under s 88(2)(a) but remain susceptible to attack under s 88(2)(c).
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