sentences:  The inventor of the device, Simon Buckhaven, worked for two years with scientists from the University of Bristol to develop the device which is manufactured by a company in England, at an estimated cost of £2,500 (in 2009).There are claims that shellfish killed with the CrustaStun taste better than those killed by boiling.Waitrose, Tesco and other major supermarkets in the United Kingdom have insisted that all shellfish products supplied to them are killed using this method.