Worries fewer crops and less vetted beef will be served on license plates . Chef spoke to Business Secretary Vince Cable about ' massive concerns ' US farmers often rear beef on vast factory farm feed lots rather than farms . Laws allow them to pump themselves with growth hormones . Concerns such as UK and farmers negotiate a new free trade pact .
Worries GM crops and less vetted food will be forced on dinner plates . Chef spoke to Business Secretary Vince Cable about 'massive concerns ' US farmers often rear beef on vast factory farm feed lots rather than fields . Laws allow them to pump animals with growth hormones . Concerns come as UK and US negotiate a new free trade pact .