A handy index for all 4 parts of this story:

Part I – In which we meet the evil Donald Trump and his poor employee, Alex Salmond, and the first ghost.

Part II – In which the Ghosts of Hogmanay Past and Present begin to show Trump the error of his ways.

Part III – In which we see Hogmanay in the Salmond household and meet the terrifying, and possibly copyrighted, Ghost of Hogmanay Yet to come.

Part IV – In which Trump tries to make amends and the survivors enjoy a happy ending.

This story was based on an idea by @BrianSpanner1 and, far more, on an idea by Charles Dickens.  All characters are fictional creations and any resemblance to persons living or dead is <ahem> entirely coincidental.