I've been looking in the Houdini help but I can't find out how to merge all the components of an object together eg. points, unused poly's ETC.
You can do it in C4D with the optimze command. Any help would be much appreciated

IndyZoneCo
A lot of the polygon geometries are not joined at the edges by default–they're only snapped together and not actually one piece. You need to add a Facet node (inside your font_object1) and turn on Consolidate… option on that node to turn the text model into one piece, then use the Shatter tool. You'll get better pre-fracture results that way.