Andrew Davies1, Andy Adler1, Den Leonard2, James Allcock2, Andrew Curwen3. 1. Synergy Farm Health, West Hill Barns, Evershot, Dorset DT2 0LD. 2. Lambert, Leonard and May, Old Woodhouses, Broughall, Whitchurch SY13 4AQ. 3. XL Vet UK, Carlisle House, Townhead Road, Dalston, Carlisle, Cumbria CA5 7JF e-mail: andy.adler@synergyfarmhealth.com.