HA! Thank you very much. Seems to be an Anaconda issue. Despite it telling me I had the latest version, it was in fact 0.1!! Hence to documentation making no sense. I have just used pip to pull in 2.1 and now the example code works. So it was the wrong documentation, but because the implementation was very old! You help is much appreciated! - Now to go and correct all my code (ARRRRR)