It's a small world (or so some people think)

Above: A Post Office Telecoms researcher giving it large

Post Office Telecoms have found the perfect voice. This may come as a surprise if you consider yourself to have a good voice and weren't approached to be part of their rigorous study but they decided that they only needed to listen to 50 voices to find perfection. Since they were searching for the perfect male and female voices they hopefully listened to 25 of each though being the Post Office they probably told the researchers that 1 woman and 49 men or any combination between 1 of one and 49 of the other would suffice.

Given the world's population is around 6.7 billion, even allowing for mutes and babies, a sample of 50 doesn't quite seem enough to qualify your findings as the perfect voice.