BS,
I can not open the link posted by Bannock however at the Farnborough air show last year the P8's display was notable as the fairly tame manoeuvres were executed with leading edge devices and flaps deployed. If these are required in normal ops I suspect the fatigue on these parts will exceed any assumptions made for an airliner where they would be used for takeoff and landing in one 'mission cycle'.
Why do you feel you must justify the characteristics of the platform. If they UK can afford this platform it will examine the platform and ask the company to justify its performance.
I also worry when RAF crews are rolled out and appear to be part of the sales team. Their role as Seedcorn is invaluable and platform loyalty is natural but not necessarily as objective as it needs to be when acquiring new capability.