Practical test: Grégoire Besson SPMLW9 semi-mounted plough Grégoire Besson is best known for its centre-carriage ploughs, designed to be pulled by the likes of the Challenger MT crawler or Case IH Quadtrac. Yet the firm is also keen to point out that it builds a vast range of different reversible models so should be able to cater for all ploughing demands. Here we try out an in-furrow/on-land version of the seven-furrow semi-mounted SP