such savvy came to be relied upon by the few remaining grocers , fishmongers , butchers and bakers in knightsbridge and chelsea , who sought out the very best for him , certain as they were that within minutes of a fresh shipment of , say , sausages from lincolnshire , norfolk rhubarb , somerset cheddar or , for that matter , truffles from tuscany arriving , that the esteemed mr. trelawney would somehow know about it and roll up to make a purchase .