Life in the Castle
After a bit more work, the castle conversion now looks like this:

and what's more, it runs like this:
Towards the end of the run it was suffering from a slight slow down every 4th turn of the wheels. I have others that do this, but haven't figured out a decent fix yet, something to do with the timing shaft I believe.
There's no whistle at the moment as I haven't worked out how to fit one in. I did cut one down until it fitted, but by that time it had stopped whistling (or maybe only so dogs could hear it). Also, there's no coupling at the rear of the tender yet.













I can report that the Castle ran well at Ruddington, with a run time of 13mins on the second fill of the boiler. It still took a long time to get properly hot to start with, but once the cylinders were up to a good running temperature all was well. I conclude that the extra insulation has indeed helped.
Job done !