Some useful UK Based links are below :
- Interpave: http://www.paving.org.uk/
- Paving Expert: http://pavingexpert.com/
- Selfbuild Portal: http://www.selfbuildportal.org.uk/
- Ethicat Trading Initiative: http://www.ethicaltrade.org/
- British Precast Concrete Federation: http://www.britishprecast.org/
- The Carbon Trust: http://www.carbontrust.com/
- WRAP: http://www.wrap.org.uk/
- Health and Safety Executive: http://hse.gov.uk/