You dont actually say who it is you are reporting to!
It may be your base airfield, who has an arangement for entry into the controlled airspace in which it resides without the need for comms with the relevant ATC unit. I am thinking Denham, who are within the Heathrow zone but are allowed to enter/exit via northern routes without contact with Heathrow Director. So if you were to do a mini nav/ex from there to the north you would stay on base frequency and no clearance is required for re-entry!
Which airfield are we talking of here?