Thanks to Dave Passey at Woofferton who has just confirmed to me
      the frequencies for the BBC Antarctic Midwinter broadcast
      tomorrow, Tuesday 21st June, at 2130-2200 UTC:
    
    "Following the test transmissions, the 6035kHz from DHA has been
      closed out, leaving just the three:
    7305 ASC
    9505 WOF
    12065 WOF
    You are correct that there will only be one transmission on Shortwave at 2130UTC. "
    (in the UK, the programme is also on BBC WS on DAB at 2130 UTC, 2230 BST. This is probably a slightly shorter edition though: 2132-2200, so best to listen on shortwave!)
    This from BBC's Media site:
    
    The BBC’s unique annual broadcast to
        Antarctica, featuring music and messages.
    The Antarctic Midwinter Broadcast is
        unlike anything else on the BBC World Service. Every year, we
        make this special programme for just 32 listeners: the team of
        scientists and support staff isolated at British research
        stations in the Antarctic midwinter.
     
    Presented by Cerys Matthews, the
        programme features messages from family and friends at home as
        well as music requests from Antarctica. For decades it has been
        part of the traditional midwinter celebrations.
     
    For the staff living at three British
        Antarctic Survey research stations (Rothera, Bird Island and
        South Georgia), and at other national bases across the frozen
        continent, midwinter is a special time. With no sunlight,
        Antarctica is at its coldest and those stationed on the frozen
        continent face months of total isolation.
     
    Midwinter celebrations at the British
        research stations include a feast, exchange of presents,
        watching the 1982 horror film The Thing (where an alien monster
        terrorises an Antarctic base) and listening to the BBC’s
        Midwinter Broadcast.
     
    As ever, this year’s programme
        includes recorded messages from family and friends of the
        winterers, music requests from the personnel in Antarctica, and
        appearances from special guests.
     
    
      - A Boffin Media production produced by Martin Redfern for
          the BBC World Service 
    
    
    https://www.bbc.com/mediacentre/proginfo/2022/25/antarctic-midwinter-broadcast
    (Alan Pennington via WOR io group)