I gues it depends on what mesage they are trying to send - as many have pointed out here before, no-one cares what colour the helicopter that comes to rescue you is.
If they want a new corporate image then a new colour is appropriate - if they want a link with the past then since the majority of UK SAR helicopters are yellow then that should be retained.
I'm not convinced that linking the SARForce to Jigsaw by dint of the same colour scheme sends any sort of good message at all.