There is a 24hr Time Signal on 6.780MHz too, AXA-210 Australian Defence Force, somewhere on coastal NSW, can hear it here 24h.
Could be Naval Base, Jervis Bay, or Air Force Base at Nowra NSW or Fairbairn ACT, they are the closest to me followed by RAAF Richmond and RAAF Williamtown, all in NSW.
Probably what AlanC is hearing in the UK.