Hi,

When I add a layer with OSGB36 (epsg:27700) projection to a project in QGS84 
(epsg:4326), I am given an option to select the coordinate transformation to 
use.  There are multiple options: https://epsg.io/27700.  The best includes a 
custom correction grid, OSTN15_NTv2.

Once the layer has been added, is there a way to see which transformation was 
used?

It isn't mentioned in the Coordinate Reference System section of the layer 
properties.  The definition of OSGB36 in the project projection selection 
dialog doesn't mention the custom transformation grid.  Is there a way to see 
it in the project XML?

Thanks,
John
John A Stevenson PhD MSci FGS
Senior Software Developer

e        [email protected]<mailto:[email protected]>
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British Geological Survey | The Lyell Centre | Research Avenue South | 
Edinburgh EH14 4AP | UK

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