At the time, I did not know the answer although Norman thought he had seen something that had come from the old cab roof. Despite much searching, I'd not found anything but then on Sunday 11th Nov. 2012, I spotted something amongst 7109's bits and pieces that was obviously the right item. (Had someone been hiding it as I'm sure it wasn't there before?)!
|Chimney Surround plate|
|The hole matches the chimney unit size|
|Easily takes the two chimney units (1)|
|Easily takes the two chimney units (2)|
A second reason is that if the hole in the cab roof does not match the position of the chimneys mounted on the top of the boiler, it is a lot easier to reposition a small plate like this than to move the whole roof.
Another mystery solved! Now how many years did that take?