OK, so to start off, here, at long last, is the vid of my Hornby class 73 with Howes' beta version of the diesel sounds. Bryan of Howes has not yet released this for general consumption as he wants feedback before finalising it.
I have put two versions here one of 5.8MB and one of 18.5MB - both are the same movie just that one is higher quality but may tax some people's download bandwidth.
Other modifications include fitting a bass-reflex speaker and reversing one of the driving axles so that the unobstructed electrical pickups are on three wheels on each side while there is now only one traction tyre per side, as opposed to having two on one side and none on the other as it comes from Hornby's factory.
Video was courtesy of Neil S Wood and his skills, camera and tripod - thanks again, Neil. (thumbs up smiley goes here when available) All editing and effects were done by me using Pinnacle Studio 12.
The smaller one:
The larger one: