Nothing wrong with RCT (or IPEM) but their entry requirements are far too high for most engineers working on medical equipment and often assume you actually work in a medical physics of EBME department

Unfortunately, many hospitals now mandate some form of credentialing to allow access to hospitals. The department for health requested a common scheme be developed for this function, which how the LSI one came about. Many of the schemes adopted by hospitals are not appropriate for those working on medical equipment, as they are designed for works departments dealing with electrical contractors and other infrastructure related trades.

The LSI scheme costs £30 per year for individuals.

Above the RCT scheme the LSI has a photo ID card to positively identify individuals that include a GS1 bar code, which the NHS is mandating for individuals as well as products.