Fly EBOS
Regulations and flow are there to protect the ATCO - however, if you are overloaded, why accept them into your sector at that level in the first place?
What are your traffic managers doing allowing flights to consistently come in at this level if it is causing a problem?
Yes, airlines file FP's in such a way as to avoid restrictions - it's not just RYR by any means.
When in flight, why should a pilot not ask for higher? If you keep giving them it, it will just encourage them to keep asking.
If you can handle the traffic, then by all means take it on and give the guy climb - but ATCOs can't bleat about being too busy or overloaded if they have allowed the aircraft to climb above its FP level just because the pilot asked.
The 'C' in ATCO stands for 'Control' - maybe ATCOs should control the aircraft instead of letting the traffic control them!!