Useful links

UK Metric Association – An independent organisation campaigning for the UK to complete metrication
https://ukma.org.uk

Metric System – The International System of Units (SI)
https://metricsystem.net

Think Metric – A guide to the metric system in everyday use
https://thinkmetric.uk

Government web site – Weights and measures and the use of metric units
https://www.gov.uk/weights-measures-and-packaging-the-law

SI units – NPL’s guide to the UK’s official measurement system. NPL is the UK’s National Metrology Institute
https://www.npl.co.uk/si-units