on 6209.83
1737 now only one station, no more hum and QRM, pop songs
1742 relay of Radio Caroline
2000 after "Dancing in the street", ID Radio Caroline, time 9 o'clock, carrier,
2001 carrier OFF (was on 6209.77 at the end)
edit : that UNID relaying Radio Caroline was already on the air at 1508 (and maybe at 1503).
Then at 1508 there were two UNID stations on 6210, including probably the usual King Shortwave with less power, but with a slightly different offset, so the hum for about 2 hours and half.
Confusing, as King Shortwave is often relaying the Radio Caroline North show.