Three UK is a major UK telecommunications operator offering mobile, broadband, and fixed-line services to approximately 10.6 million customers.
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Three UK lacks entity-level emissions disclosure, relying entirely on parent company CKHGT's group-level data. Carbon footprint, supply chain, and trajectory evidence are absent at the operating company level. Strong renewable electricity commitment (97%) and SBTi-validated targets are offset by no biodiversity policy, minimal waste metrics, and no standalone sustainability reporting despite £2.59bn revenue.
Three UK scores 41/100 (Below expectations) on SINK's independent climate assessment, scored from public data only. Fees pay for the review, never the result. Last verified May 2026.
That places Three UK joint 343rd of 847 companies scored, and 13th of 18 in Telecommunications.
Where Three UK sits among telecommunications peers.
Among the 18 major telecommunications brands we've scored, Three UK sits 13th of 18.
Its three lowest-scoring questions, and what the evidence didn't show.
No biodiversity policy, TNFD disclosure, or deforestation commitment found.
No water consumption data, footprint assessment, or management policy found.
Three UK does not publish standalone Scope 1 & 2 emissions.
A score changes when the evidence does. We use new published evidence at the next rescore. Evidence that isn't public can count through an evidence review.
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Get in touch →Strongest on Controversies & Red Flags and Energy Source (8/10, 7/10). Weakest on Nature & Biodiversity Impact and Water Impact (2/10, 3/10).
The 3 companies in the sector scoring nearest above Three UK.
Airtel Africa discloses emissions data aligned with GHG Protocol but lacks third-party verification.
See the breakdown →Deutsche Telekom has achieved extraordinary operational emissions cuts (94% Scope 1+2 reduction since 2017) and holds SBTi net-zero validation, but Scope 3 reduction velocity is insufficient for its 2030 targets.
See the breakdown →BT Group discloses operational emissions comprehensively with third-party assurance and has achieved 52% absolute Scope 1+2 reduction.
See the breakdown →The formula and all 9 sources.
Same ten questions for every company. No private weighting.
SINK = (0.3 × Base + 0.7 × Performance) × Scale9 sources used in this assessment. All publicly available. Each row shows which of the ten questions it informed.
If you believe a source has been misread or a newer version exists, submit a challenge.
Three UK is a major UK telecommunications operator offering mobile, broadband, and fixed-line services to approximately 10.6 million customers. Founded in 2001 and headquartered in Maidenhead, it operates as a subsidiary of CK Hutchison Group. The company competes in a highly regulated UK telecoms market dominated by larger players.
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