Peter Dalby wrote
 
 Some years ago I read of some Australian research where
> Roundup had been fed to bees in syrup with little or no ill effect but I
> dont have a reference for this.
 
I can confirm that this research was carried out.  This work was done by Graham Kleinschmidt from Gatton College.  The results were as Peter says.
 
Trevor Weatherhead
AUSTRALIA