I have worked both 4 days,4 off,4 nights,4 off, and 2 days,2 nights 4 off. I can say that 2/2/4 is much my preferred shift, only two early mornings then a lie in, followed by just two nights. I usually found four early mornings in a row were more tiring that the nights. I'll stick with the lie in after two days. Current shift pay for 2/2/4 is around £6.5K