UK financial regulators — operating under UK EMIR and UK MiFIR — expect entities involved in reportable transactions to hold a valid, active identifier from the GLEIF system. The code must not be Lapsed at the time of reporting. Registration is available through accredited issuers such as TNV LEI, using the entity's Companies House number for verification. For firms new to the requirement, the entire process from application to issuance is typically completed within one to two business days.