It seems the Processing options in QGIS 3.0 no longer include R Scripts (they are not listed as available along with SAGA, GRASS, and GDAL). Is this a change in this version of QGIS or have I had a problem with installation?
Actually it's not broken - they were removed from the master install, and are waiting for someone to step up and maintain them as a plugin. ... The situation won't change with 3.0.1/3.2 until someone steps up.