Interesting. It was my understanding that there was only a rumour that a Henry Burstow cylinder recording was to be found somewhere. Everyone I have asked (as I have a great interest in actually hearing the voice of someone that Lucy Broadwood collected from - other than the other cylinder recordings available at the British Library and online) has told me that they have never come across one. And as far as I recall that includes Andrew King, who was responsible for curating that part of the British Library collection for some time, and is now doing research into cylinder recordings for a PhD. I'll try dropping him a line to see if he can confirm or otherwise.