Thanks Pikarus for the solution it sort of works.
However this is just ridiculous!
If I want to move a leg I have to CTRL click the chain (three clicks with a key press) then I have to click again with a different key press (because if you didn't you will duplicate your last selection) and it doesn't work with IK so I have to then right click after moving the leg to set the anchor. And then decide I want to change the position, oh dear all those action again.
I don't want to be playing a musical instrument with my mouse and keyboard.
I want to set up my rig, attach helpers to my IK chains and just single left click and drag them around.
This is basic stuff for animating character rigs check out Puppet2D for Unity to see how its done properly.