On the majority of kit cars using poly bushes on the rear lower wishbone to upright connection with the long bolt,how many of them work correctly,ie letting the bush turn on the crush tubes?

Presuming they should turn on the crush tube,like the inner ones,to try and keep the upright as straight as possible?

If they are solidly bolted together,like mine were,this would cause the Upright/wheel to go more into negative camber under compression?

Like this;
http://s723.photobucket.com/user/enicpic/media/Roadster/DSC_04631_zps2fbonhbp.jpg.html

The bush should stay stationary just in relation to the wishbone, and should rotate around the crush tube. Which means the face of the bush that sits against the upright should be free enough to move.

It won't cause greater negative camber as the upper wishbone will prevent that, however it will cause unnecessary stresses and potential wishbone failure if it's not free to move.

When mine finally get put together, I'll be putting a teflon washer between the side of the upright and the bush.