Scenario: The Sole Director of a Company was invited to work aboard a client's chartered yacht for several days (exact time frame undisclosed). They consider it to have been a "genuine working engagement" - the client runs a boat charter business and they were on board for "legitimate client meetings and work". The director also took their partner (i.e. girlfriend) on the trip. The boat, accommodation and meals were "provided as part of the client relationship" at no cost to the Director. Return flights (for Director and Partner) were mostly covered by a personal travel credit the Director had, with approx 1/4 paid for by the company. The Director has stated it was "a working trip with a personal dimension". Note, according to the client's website, an 8 hour cruise on the yacht is charged at over $14,000 and a 24 hour cruise is $17,000-$20,400 (depending how much you eat/drink/use).
Question(s): Would any component of this trip be considered a personal fringe benefit provided to the Director by the Company? If so, how much would reasonably be considered to be a personal benefit? Does the fact that he never would have booked something like this if it weren't for the company / client relationship make a difference?