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FYI @JoeM - the start file is missing the bundled data and (very generously) includes a solution.
I created a new start file using the most recent posted solution so you can switch out the files.
Here's my solution. Very pleased with the Generate Rows tool that increments by day between the Start and End dates - incredibly satisfying. I can see that others managed to use fewer tools but this did the job nicely for me.
I remember the joy I had a while ago when I finally figured out how to make 'Generate row' tool to work with dates.
For 'beginner' level difficulty this was particularly tricky. Quite enjoyed the double cross tab.
Pretty round about method but got there in the end.
Lots of steps, but got the results.