Posted: 05/06/2013 at 12:40
The only problem I have ever heard of regarding weedkiller, was when Horse manure had been contaminated with Aminopyralid weedkiller. People who had this problem are still suffering from it 4 years later, but that was not in peat free composts.
I use Vital Earth mainly because it comes from nearby so the road miles are not too bad. Never had any trouble with getting stuff to grow.
I would add that one has to remember that the peat free stuff is made from whatever people put in their green waste bins and that could well include plant material which has been treated with weedkiller. However the manufacturers of this material all claim that the heat and other treatments they give their product remove things like that and any other pathogens. Pity the treatment does not remove Oxalis cornuta seeds though.