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? -- The Open University is incorporated by Royal Charter (RC 000391), an exempt charity in England & Wales and a charity registered in Scotland (SC 038302). The Open University is authorised and regulated by the Financial Conduct Authority in relation to its secondary activity of credit broking.
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