No offence intended at all and I have been to Swanwick and understand the LTCC and LACC system. I think the descents are meant to be helpful and not require me to descend too rapidly. I just prefer if within a particular sector to stay high for predominantly fuel and TAS reasons if that doesn't cause the controller any problems. Certainly not looking for a customised service.
I am usually coming back at night and it has almost always been accommodated. If not then it is of course not an issue at all. I just often feel a bit clumsy asking for it.