Just a note of caution about jumping straight in on the quoted lowest vibration charateristic of a particular tool; it could take twice as long to do the same job and actually increase the exposure to the user.  There's a balance to be had here and careful assessment of the task and risk needed.

Also remember that manufacturers data is often very different from actual use and exsposure gained.  Hierachy of controls to consider, elimination, subsitution, job rotation, etc.  Action and limit values as well as health surveillance to consider.

Wealth of information available now; HSE a good starter. 

Thanks everyone for your replies, I think as Connor says, getting a loan of a couple of different options to try is our best bet, as you say different grinders work differently so we'll only know if we try.  

I've gone through the heirarchy of controls, but there is no possibility of elimination of grinding although we have reduced it as much as possible. I've done analysis on trigger time and even with the grinders we're currently using which are all relatively new and adding 15% added to manufacturer's figures, we're well below the ELV and most of the time below the EAV. We also have in place health surveillance.

And I'll have a look at the Metabo angle grinders Hilary.

Thanks again

Kelly