Ok, so am no longer in the industry anymore - but still like to keep an interest. I've got to say that the 4 on 4 off is imho the best shift. I've done some bizarre and very irregular shifts in my first ops job, but then again it was for a bizarre and irregular operated company
I then moved to Chippy Fryer, where I did lates and earlys, 4 on 2 off the only down point being we did lates to earlys, and that mucked up the sleep pattern a tad.:o My final ops role was with Virgin, and that's where I worked the 2days 2nights (12hours) followed by 4 days off..... By far the best shift pattern, had loads of time off and still earnt a decent wage
Now starting with MET Police (training commences in Januray 2003), their shift patterns keep changing all the time, but atleast i've had experience of similar patterns, and can hopefully contend with anything they throw at me