I have been tasked with getting OS Mastermap topography data into QGIS system to compliment our other map layers. The data comes in .gz format. Which I am told needs to be decompressed before I can do anything further? After decompressing it using WINRAR it turns it into a file which has no file type? I assume it is supposed to be .gml?
I have read I then need to convert it into shape file format so that QGIS can read it, so I use OS GML to OGR python plug in. Which seems to do nothing...or says "processing stage failed with code 1". Can anyone give me any advice or a brief walkthrough on how to get OS Mastermap data into QGIS?