Providing they were properly maintained and operated within the 13,600lb MAUM and the 3,200ft/lb Max Tq limit the Brit-Mil used, they should have been fine for logging work but what spares availability was like I don't know.
As the Uruguayans discovered, you need someone who knows the fuel computers well and the setup procedures for them intimately or you will end up with endless computer freezes (no manual throttle option).
However, getting advice from an imposter (the CAA advisor) who doesn't know one end of a Wessex from the other, probably didn't help much.