Found this on website :
"What is a standard?
A standard is a published document that contains a technical specification or other precise criteria designed to be used consistently as a rule, guideline, or definition. Standards help to make life simpler and to increase the reliability and the effectiveness of many goods and services we use. They are a summary of best practice and are created by bringing together the experience and expertise of all interested parties – the producers, sellers, buyers, users and regulators of a particular material, product, process or service.
Standards are designed for voluntary use and do not impose any regulations. However, laws and regulations may refer to certain standards and make compliance with them compulsory. For example, the physical characteristics and format of credit cards is set out in standard number BS EN ISO/IEC 7810:1996. Adhering to this standard means that the cards can be used worldwide.
Any standard is a collective work. Committees of manufacturers, users, research organizations, government departments and consumers work together to draw up standards that evolve to meet the demands of society and technology. British Standards staff act as secretaries to these committees and project manage the production of standards. As the world’s oldest National Standards Body, BSI has over 100 years’ experience of bringing together these often very varied viewpoints and facilitating consensus.
Electrotechnical standards are harmonized internationally by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). The British Electrotechnical Committee (BEC), working closely with BSI ensures that the views of British industry are represented in Europe and worldwide.
To give you an idea of the scope of British Standards' work, around 2,000 new and revised standards area published each year and some 1,350 technical committees and working groups covering 20,000 standards are supported."
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Do not know what laws are actually in place to make British Standards legally binding to our industry, other than an advisable best practice.