Confusion over Text to Speech on Kindle Titles

As many readers of this blog will know, most Amazon Kindle titles have a facility known as Text to Speech enabled. Text to Speech enables the contents of Kindle titles to be read aloud to readers, and is particularly useful to people with certain disabilities, for example those who are registered blind and who are not able to read print. You can find details of how to enable Text to Speech here, https://www.amazon.co.uk/gp/help/customer/display.html?nodeId=201829850.

I am myself registered blin...