SILK PROFILE

Jeffery Onions KC

UK Bar 2026

One Essex Court

Ranked in 2 practice areas

Energy & Natural Resources

London (Bar)

28 years ranked

Commercial Dispute Resolution

London (Bar)

31 years ranked

Chambers Review

Provided by Chambers

UK Bar

Energy & Natural Resources - London (Bar)

Band 2

Individual Editorial

Jeffery Onions KC is acclaimed for his undoubted intellect and fierce commitment to complex commercial cases, many of which have a regulatory or environmental angle. He exhibits deep energy sector expertise and acts for heavyweights in the oil and gas industry. His practice spans advisory and advocacy work, and sees him handling both arbitrations and High Court litigation.

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Strengths

Provided by Chambers

Jeffery is a great advocate, commercially astute and user-friendly.
Energy & Natural ResourcesUK Bar
Always on top of the detail, he gives excellent submissions and knows what tribunals want.
Commercial Dispute ResolutionUK Bar
Jeff is extremely responsive.
Commercial Dispute ResolutionUK Bar
As well as being amazing at his job and very experienced, he is very easy to deal with. His work is exceptional, and he is so approachable.
Commercial Dispute ResolutionUK Bar