Respond to these showcases www. ajplus. co. uk/ajdirect Readers may obtain information about these products by filling in the enquiry numbers on an AJ enquiry card. Advertisers wishing to promote their products on these pages should contact Chris Bond on 020 75056816 Knauf Insulation has launched the first of its online learning programmes. An Introduction to Sound Insulation gives an immediate working knowledge of Approved Document E of the Building Regulations (Resistance to the Passage of Sound), and allows people to learn at their own pace and convenience.