Sets of 32 (I think) EE numbers by OM. Sets separated by 4 or 5 buzzes. Header is "578" repeated 3 - 4 times at beginning of each set. Some numbers repeated "again" within a set.
Fading in and out, so haven't been able to copy a full set, however they all start differently unless they go in a cycle.
Later noticed that these were sets of 3 numbers all ending with "8" header of 578.