Lou
> could  you explain the physics/chemistry of this, or refer me to an 
> article on same, please?

It is the physics of a supersaturated solution.  If you add nuclei, for 
example pollen grains or a small amount of finely set honey, to clear honey 
then it will set faster.  Plenty of articles on the Internet about the 
process.  I seem to remember using sodium thiosulphate to demonstrate the 
process when I was at school.  Try 'supersaturated solution crystallization' 
in Google.

Best wishes

Peter
52.194546, -1.673618 

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