Aberdeenshire Wind Turbine

There was no underpayment - the deferred interest was paid to the current owners of the loan units rather than being directed to the sellers.  So the totals paid out added up to the expected amount thus no alarm bells were rung.  Unfortunately this was a relatively subtle bug that would be very hard to detect automatically as the algorithm required to detect the mispayment would be near identical to the one used to make the payment in the first place.  As mentioned elsewhere this entire subsystem is being replaced with a more elegant and less complicated design.