Ofgem has published a helpsheet relating to the Energy related Products (ErP) Directive and the domestic Renewable Heat Incentive. A link to this helpsheet is available here.
You can also find information on the MCS website - link here.
MCS is a mark of quality and demonstrates
compliance to industry standards that companies
strive to meet. It highlights to consumers that
companies are able to consistently install or
manufacture to the highest quality every time.