While Cathay Pacific's first class fare rules may change from one country to another, on itineraries departing Hong Kong (such as to London), the airline sells two types of first class tickets: First Class Standard, and First Class Flex.\
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First Class Flex is naturally the most flexible, and has no charges when cancelling and refunding the ticket both before and after departure, with 'no show' fees also waived if requesting that refund after departure.\
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First Class Saver is instead lower-priced, but has added fees attached to these and other changes. Expect to pay HKD$1,800 to cancel a flight before departure, or HKD$1,800 plus a no-show charge of HKD$2,200 to cancel a first class flight after departure. These amounts will be deducted from your refund.