Importing TIFF file for use as basemap in ArcGIS Pro

I have purchased an Ordnance Survey map for use in ArcGIS Pro as a basemap. The file that I received came in a zip file and contained the a TFW File, TIFF File, OVR File and an XML Document. When I open the TIFF file normally in Windows, it is a high resolution file (73 mb). However, when I "Add data" in ArcGIS Pro and import the TIFF file, it is very blurry as a base map and is not high resolution.

Are there any special tips to follow when importing a TIFF file for use as a basemap in ArcGIS Pro?