Latest Version of Hornby 9F... running/motor/haulage issues?

Following on from my previous video, I received some comments that there were "some concerns/issues" with the motor/haulage which had emanated from various model railway blogs and forums on the internet. I was unaware of this as I rarely look at these threads, so I decided to investigate the efficacy of this myself.

In this video I have run two 9Fs simultaneously, one being 92194 which is the latest Hornby version under question, with three of my earlier versions of the 9F on what might be described as typical consists and loadings. In each of the three separate sessions I have swapped the latest 9F with one of its earlier counterparts so as to ensure absolute parity and comparison. I leave you to draw your own conclusions.