I now have the answer!
The Hire Shop didn't have the surface remover so borrowed and hired th following:
Bosch GSH 388 Chisel Hammer
Makita 9069 with Steel Circular Blade
The hammer was good a removing the high bits but took a lot of effort. However, the Makita, was a revelation and...
I took my kitchen tiles up to discover a lot of adhesive/cement on the wooden sub-floor. As I am trying to lay an oak floor on top I need to get the stuff removed. I have been using various chisels with a bolster hammer and a heavy sander - none of which have given me the desired result.
I...