Highcharts has an option to reverse the data on the y-axis:

 yAxis: {
        reversed: true
    },

Here is a JSfiddle example:
https://jsfiddle.net/gh/get/library/pure/highcharts/highcharts/tree/master/samples/highcharts/yaxis/reversed/

Looked though the BT charting wiki but I can't see how to implement
this in a BT chart.

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