T-Bug
An Interesting question.
Ask 10 ATCO's, bet you get 10 answers!
Does raise an interesting point though - We have been told that it is the responsibility of the first LACC controller to ascertain any RFL change that may be requested. What amazes is the number of aircrews who request a totally different level to that which is "requested" on our copy of the flight plan.
How many of these are caused by
a) the Bulk Store File, or
b) a mis-read by FPRS?
As an example, a recent low-cost carrier to the Irish republic was asked his RFL. His reply "Let me have a look. . . . we are flight planned at FL360".
The paper strip in front of me clearly stated RFL 280!
Let's just hope that one of these doesn't do what you suggest.