Thanks again Richard. The book turned up this morning. Some super pics and the drawing on page 40 is really helpful, but I'm still a little vague as to how the coal got into the lift hopper. I'm not sure if modellers licence has been applied to this particular tower, but the skip that is being lifted is deeper than the hopper below and would not be able pass between the lower hopper and the tower.
Was this just hand loaded? Surely not....
The pic on page 38 seems to show the lift hopper going behind the base hopper which would suggest it was auto loaded below ground.....
The pic on page 13 shows the hopper higher up, but if that it is the lift hopper at the top, then it is a different shape.
Here's a better pic of my coaling stage so you can see why I am a little confused...
(Just realised clicking on the pics enlarges it...

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Coaling Stage.jpg [ 134.69 KiB | Viewed 57 times ]