I did buy manure from the garden center last year, when I heard the stories of contamination I was frightened to use it so it has been stored at the end of the garden ever since, I think may be it is OK! to use although I would be very upset if it polluted my garden. I also wonder about council compost as I have seen some of the sruff that people put into the green waste skips, like some of the perenial weeds and I have had my garden badly infected with chickweed and many other very difficult weeds to get rid of.