In the letter, Slater stated: "Despite our continued requests for DEFRA to set out its plans for DRS and my recent correspondence dated March 8 on such matters, it is extremely frustrating to hear about details of a further significant delay to the DRS launch from media reports." She continued: "As you know, Scotland would now have an operational DRS if the UK Government had not prevented it from moving forward as planned. "This would have provided a launchpad for wider DRS across the UK meaning we would all be experiencing the environmental and economic benefits much sooner."