25 The option provided by the call option deed expired two years from the date of the deed. The deed is stamped 1 June 1995. There was evidence that the call option was extended by two years from a letter dated 1 December 1997 written by Pac-Asia to PKR. When the application for an injunction was argued before Anderson J, the extended option period had not expired. The respondents contend that, on 1 December 1999, prior to the hearing before McKechnie J, the option had in fact expired and Pac-Asia has at no time attempted to exercise it. In answer to this argument, senior counsel for the respondents relied on two facsimiles, which pre-dated the call option deed. The fact that these documents reflect prior negotiations, as it were, makes it difficult for the respondents to rely on them, as there is a strong inference that they were subsumed by the later deed. The issue as to the continued existence of the share option apparently took the respondents somewhat by surprise and, at the trial, different arguments and different evidence may be relied upon. On the material to which this Court was referred, however, the respondents' case as to the extension of the option period, while not entirely unarguable, has to be characterised as relatively weak.