DTY/LKS,
The restriction must be restated if you still require it. A new clearance cancels the restriction.
..
What really pisses me off is the fact that in our carbon footprint, tree hugger, save a bit of gas world, we are being forced down early and at more and more restrictive levels - 270 at LIFFY is 4500 feet low on profile into MAN.
Agreed, however any ATC intervention is going to cost fuel. Any level restriction, vector, speed control, holding, waiting for takeoff.... What is the safe alternative. I suggest that the other alternative is late descent and more track miles.