wonderboysteve, this is actually only partly true. Martin Withers was asked the exact reason for ceasing flying in an event I attended and this is what he said as I recall.
It was Marshalls who were unwilling to continue OEM support beyond 2015. VTTS did find an alternative company (Cranfield) who were willing to assume the role, but Cranfield were not acceptable to RR. So you could argue it was Marshall's that pulled the plug rather than RR, as RR were willing to continue further if Marshalls had not withdrawn. The remaining engines, through careful management, had sufficient life for a few more seasons.