But Ms Hann said many companies override the statutory limits provided by the Act with terms in their own contracts.
But where time limits included in a contract are applicable in a court, they cannot be used to restrict the amount of time a client has to complain to the Financial Ombudsman Service.
Ms Hann added: "There is no downside to including limits if the worst that will happen is the court finds it unreasonable and strikes it off."
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