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@mattysmith22 reckons we ought to defend against someone munging all the VAT data on accident and to be fair VAT Rate silently defaulting to zero is suboptimal behaviour. Also dates far in the past cause issues, which I think is because it's before the start of VAT.
Probably can kill two birds with one stone here, but not sure how best to do it.
(FTR, this was all caused by me setting a test date to 1984, as you do, and that test erroring because of the latter aforementioned behaviour....)