This has got all the key ingredients of a classic Christmas movie, one that's shown every year without fail.
It contains distress and even a death. You get to mourn the the loss of a good, honest hard working engine and then, whilst fighting back the tears of such a tragic loss, BAM! you're kicked again when it's replacement doesn't turn up
But, what's this, there is light at the end of this dark tunnel in the shape of doughnuts, maybe all is not lost.
Then the engine arrives and is fitted! Hoorah! There are tears of joy, not sadness and Luke drives off into the sunset being waved off by The Zed Shed crew (OK, I appreciate at 8pm on a December evening, the sunset had long since gone).
Dear Mr Speilberg,
I have an idea for a screenplay.......