1. School of Food & Nutritional Sciences; University of Reading; Whiteknights; PO Box 226; Reading; RG6 6AP; UK
2. SGS UK Ltd; Meadow View; Alkerton Oaks Business Park, Stratford Road, Upton Estate; Banbury; OX15 6EP; Oxfordshire; UK
3. Crop and Environment Research Department; Harper-Adams University College; Newport; TF10 8NB; Shropshire; UK