information on the nature of the complaint would be useful..................
after all, from what i understand from working in the travel trade is that Viking airlines are not a Uk airline or a registered UK airline (hence the guy from sunvil no longer having to worry about the operation of said airline)
now if your question is about a reservation on the airline, would this be a direct booking with the airline (and as a non UK registered airlene - then not a damn thing a UK court could argue on), or a booking through a third party who chartered a viking airline aircraft.