My reply was that the rules don't allow me to shorten the time behind a Heavy, but if you or anyone else ask me for clearance for take off stating that you don't need the 2 minutes then my reply will be " Cleared for take off at your discretion "
I asked the ATC at Hawarden that when they forever refused our Police helicopter to depart due to wake turbulence. Their excuse was that they were legally obliged to make us wait the required amount of time. They refused to budge despite the fact that I could draw representative flight paths to show that we never got any where near the wake.
Never had the problem at Liverpool. A simple "request immediate departure" and we were cleared to go.