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 Ziegel Building Blocks, from ecological building-materials specialist Natural Building Technologies, are a thin-joint system that creates solid, load-bearing walls that easily surpass the latest building regulations. They are robust, and a shell can be built in under half the conventional time.