STANELCO, which makes biodegradable packaging, improved 3/8p to 5 5/8p. Buyers reappeared amid revived whispers of a contract with a big supermarket chain. It has been working with J Sainsbury on food trays made from potato starch that are created using radio frequency heat treatment and then moulded. Dealers expect the stock to be re-rated once, as expected, it wins a court battle over patents with Bio-Progress.