Jeremy Clarkson has shared the one key reason why he is unable to offer jobs at his Cotswolds farm to certain teenagers keen to offer their help. Just days after Clarkson issued a blistering response to the Conservatives’ plans for National Service and suggested youngsters should work on farms instead, it seems it’s not as simple a proposition as he may have thought. Over the course of three seasons of Clarkson’s Farm now, Amazon viewers have witnessed firsthand just how much effort and manpower goes into farming Diddly Squat as well as keeping the popular farm shop afloat. Kaleb Cooper, Charl…