[Qgis-user] changing .gsb file for transformation

[Michael.Dodd]

I am trying to use the uk ordnance survey system in qgis along with other data in wgs84 and background imagery in other crs.  I have the relevant .gsb files for the ostn02 transformation (which currently use instead of the ostn15 version) but can't see how to persuade qgis to use it instead of one of its several less accurate 'ballpark' transformation methods.  How to do this?
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