Potentially dangerous glass worktop saverI was preparing the ingredients for my lunch: Warburtons bread for ham sandwich, chopped home-grown tomatoes, top off the butter dish; reached for the jar of mustard from the cupboard over the glass saver, and dropped it on to the glass worktop saver. It shattered in to hundreds of fragments of various sizes, including icicle shaped shards. They completely covered the worktop and the kitchen floor. I recently bought some from Sainsburys, and had previously bought some from Tesco. They appear to be identical; smooth on one side, and rippled on the other. I don't know which shop the shattered one came from. It was a lengthy cleanup operation, and everything had to be inspected/washed, and all food thrown away. I shall be replacing them all with something safer.