I have a map saved as MrSid file which when loaded in QGIS displays as a southern hemisphere location despite being in the UK. When looking at the .sdw file the northing is positive but in QGIS it shows as negative. Adding a minus sign to the northing in Notepad and resaving still displays it as a negative value. How can I correct this?
The CRS data you report looks rather broken, with the k factor value stored in other parameters where it does not belong.
For reprojecting rasters, you have to use
Raster-> Projections -> Warp. Reprojection using
Save As only works for vector data.