United Kingdom
Russell Group Universities (Official page)7.0 overall, 6.5 each
Russell Group universities (Oxford, Cambridge, UCL, Imperial, etc.): Band 7.0 overall with 6.5 minimum in each component. Some departments (Law, Medicine, Linguistics) require Band 7.5.
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Rules and exceptions
UK universities set their own English language requirements for academic staff — there is no centralized regulatory body equivalent to the NMC or TRA. However, the Skilled Worker Visa (required for most non-UK academics) mandates at least CEFR B1, which corresponds roughly to IELTS 4.0.
In practice, Russell Group universities (Oxford, Cambridge, UCL, Imperial, Edinburgh) require IELTS Academic Band 7.0 overall with no component below 6.5. Post-92 universities may accept Band 6.5 overall.
Academics who completed their PhD at an English-medium university in a majority English-speaking country are often exempt from IELTS — but exemption policies vary by institution. Always check the specific university's HR guidance for international applicants.