There can be real problems if the grass cuttings come from lawns treated with products that contain clopyralid.
There is also the possibility that another broad leaved herbicide called clopyralid, might have been used on garden lawns. Any grass clippings used as mulch or compost will cause the same sort of damage to edible plants. Make sure that you read the label very, very carefully before you apply any chemicals to your lawn!
Do not use any of the grass clippings, treated with clopyralid, for composting or mulching.
Do not put the grass clippings, treated with clopyralid, out for collection for recycling green waste by the Council, as this can lead to contamination of commercial products, such as “peat free” growbags and liquid organic fertilizers. There have already been recalls of such products because of clopyralid contamination.