Reply from the seller is
I have spoken to the model builder who built this loco. The loco comes equipped with whistle, cylinder drain-cocks and steam brakes all operated by r/c. This kit was fitted with all the available extras and can be worked normally or as a true compound. The gas filler valve has also been changed for the Ronson style one. He feels it may need recommissioning as it has stood in a glass case since it was built. By this he feels the operation of the servo's will need checking.
I also know that the loco has never been run and has sat in a glass case since being built; obviously this could be good news or could be bad.
Carl, the only link I have is this guys email address so I will mp this to you.