I'm not sure being able to verify that it's vaguely correct really solves the issue. Consider how many edge cases inhabit a "30 sheet, mind-numbingly complicated" Excel document. Verifying equivalence sounds nontrivial, to put it mildly.

> They have an excel sheet next to it - they can test it against that.

It used to be that we'd fix the copy-paste bugs in the excel sheet when we converted it to a proper model, good to know that we'll now preserve them forever.

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