Many thanks to SRAA contributor, Mark Hist, who notes the following:

Thanks for alerting shortwave listeners to the British Antarctic Survey broadcast. It felt very poignant listening to a broadcast aimed at such a small number of people, with the voices of their loved ones being launched around the world.I was able to record the broadcast from only 100 miles away from the Woofferton transmitter, so needless to say the quality and strength was very good. I imagine hearing that broadcast buried in the noise from far away with those happy birthday songs and best wishes must have been very emotional for its intended audience.I enclose a short segment from my 30 minute recording, plus a photo (above) taken the next day of my set up (it was dark at the time of the recording).