North Denes is licensed by the CAA, but only for IFR/VFR ops by CHC and VFR ops by other helicopter operators authorised by CHC (ie the CAA have delegated CHC with the authority to permit such movements subject to CAA restrictions).
Fixed wing a/c are not permitted to land at the airfield at any time.
Further to what Slyguy wrote;
Denes does have the NDB approach to 10 and 26, but the approaches can only be used in conjunction with the DME at Norwich by CHC , Bristow can only use it for legitimate training purposes and not for revenue flights.
Norwich Airport and ATC is not, never has been and never will be run by Marshalls.
Norwich ATC do not provide a radar service of any sort for Denes.