I flew Hercs from Lye up until a couple of years ago. These days it is less busy due to the operational tempo, (I know it sounds crazy but less training goes on when the fleet are tasked heavily, therefore fewer aircraft in the vis and inst cct and the new J does 95% of its trg in the sim as well.)
ATC are generally GA friendly and will accommodate if possible. Simply call up with standard r/t for crossing a control zone and they'll normally be able to let you through. Don't become Red 10 though!
