Hi All
Some years back I had the pleasure of working with Dave Powell, who was Harry Powell's son. Dave worked on these model locomotives with his father, mainly in interpreting the full size drawings into machining drawings for the models. Harry Powell was a boilermaker at Crewe, his son was sometime in charge of the Derby BR Research machine shop alongside the Mechanical Testing Laboratory that I was sometime in charge of.
Dave told me once that his father had been confidentially asked not to enter any more of his work into competitions in order to give the rest a chance!
Harry's work output was prodigious, including three-at-once large scale (71/4" or maybe bigger) narrow-gauge locomotives that from memory were of Vale of Rheidol prototypes.
Great memories of BR Research in Derby, sadly now mostly gone due to the benefits of railway privatisation and the overwhelming need to make a profit for the bean counters.
Jim