At civilian airfields, the ident beacon will flash the morse for the predominat instrument approach facility, i.e. if the airfield has an ILS the beacon will flash I - xx, if has an NDB it will flash the code for that e.g for Southend "SND", if there is no instrument approach it will broadcast the ICAO three letter code, i.e HUY.
As I said, these things are incredibly ancient and inefficient, most are a mass of flurescent tubes and very expensive to maintain, consequently when they conk out they go to wherever they go to die.