Chuff34006

I have purchased a Dapol 43XX with sound 4S-043-004S and it runs very well even at slow speeds unlike the horrible terriers which I have found totally unreliable. I have yet to set up random sounds which could be interesting. I would like to know who produced the sound file for it as I have another none sound fitted 43XX and would like to use the same sound file on it when I fit the locomotive with sound. Any help appreciated.