Common technical standards

Technical specifications for interoperability
Frequently asked questions, a catalogue of TSIs and a list of derogations (exemptions) and critical error solutions available in the United Kingdom.
- Frequently asked questions about technical specifications for interoperability
- TSI catalogue
- Notified National Technical Rules (NNTR’s)
- A list of notified bodies appointed in the UK
- Derogations, a list of all derogations (exemptions) applicable in the United Kingdom.
- Critical errors, a list of critical errors and solutions available in the United Kingdom











