Hi Greenmonkey
No, I don't work shifts.
However, if you are on a basal/bolus regime, this really shouldn't cause too much of a problem. Logically, if you keep taking your basal insulin at the same time each day (so, if it's usually at 10pm, take it at that time whether it's bed time or the start of a shift) and then take your normal amount of bolus insulin with each meal.
Keep testing and figure out what works. Obviosuly, you might need to figure out how things like the dawn phenomonen are affected by the shift work and sleep patterns.
Finally, I take it you have gone into this job knowing about the shifts? If it was a change from your usual shifts in an existing job and you were finding it difficult, you could ask to change back on account of your diabetes.
However, I woulnd't imagine it will pose a problem.