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This practical 2026 guide explains how to get e‑liquid tested for contaminants in the UK: choose ISO/IEC 17025 (UKAS)‑accredited labs, understand essential tests (aldehydes, metals, nicotine, diketones), expect costs of £500–£1,500 per product and typical 10‑working‑day turnaround, and prepare documentation for TPD/TRPR and the new VPD. Learn which laboratories are active and how to submit samples effectively.