Especially bearing in mind the small number of hours the crew had on the Mk2, and their concerns over the safety of the type, a homing demonstration in marginal weather would surely not be on the agenda; the crew would be only interested in conventional navigation to the destination.
Bearing in mind the nav kit on board, a lat. & long. passed over the radio is far more useful, btw. I can think of no reason why these passengers would be interested in a homing demonstration in the first place. From the passenger seats they would have no way of observing and assessing the technique of any type of homing, or even seeing out of the front of the aircraft.
As I have pointed out to WK on more than one occasion, if the use of this equipment was the "real" mission, why would the captain ask for a Mk1 Chinook for the flight, which definitely did not have the equipment fitted?