Sir; re two successive letters in The Grocer (Peter Yarwood, May 11 and Peter Jones, May 25) on the carrier bag debate: Bin this bag idea' and Action needed on bags'. Neither correspondent realises their ideal solution already exists. Using established and proven polythene technology manufactured under licence, Symphony Plastics Technologies offers retailers low cost plastic carrier bags and other products, capable of high level decoration, that can degrade quickly and naturally in a controllable time period. This is achieved with a total absence of harmful bi-products after degradation. Ian Bristow Director, Symphony Plastics {{LETTERS }}