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Jonathan Sacher


Jonathan Sacher
  1. People /

Jonathan Sacher

Jonathan Sacher

Partner


London

Jonathan Sacher
  1. People /

Jonathan Sacher

Jonathan Sacher

Partner


London

Jonathan Sacher

Partner

London

T: +44 (0) 20 3400 2307

M: +44 (0)7884 181960

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  • Biography

  • Experience

Biography

  • Co-Head of the multi-disciplinary insurance sector at BCLP.
  • Described in Legal 500 as 'world-class'.
  • Rated in the top five Global Elite Thought Leaders by Who’s Who 2019.
  • Known in the industry as one of the “Reinsurance Gurus” 
  • Focus on reinsurance/insurance, arbitration, litigation and dispute resolution for UK and international insurers, reinsurers and brokers.
  • Acted in a number of high profile reported Insurance/Reinsurance cases covering: Covid-19, hurricanes, personal accident, life, financial institutions, war risks, and most classes of business.
  • Examples of cases range from the World Trade Centre, New Zealand Earthquake, Covid-19 and volcanic ash losses to life reinsurances and financial institutions disputes.
  • Ranked Band 1 in Chambers and Partners as a leading individual for insurance and reinsurance disputes.
  • Professional memberships include: ARIAS UK, ARIAS US, the London Court of International Arbitration, British Insurance Law Association, World Traders Livery Company and associate membership of the Chartered Institute of Arbitrators.
  • Freeman of the City of London
  • ARIAS (UK) Management Committee

Admissions

  • England and Wales

Related Capabilities

Insurance & Reinsurance Insurance & Reinsurance

Insurance: Corporate & Transactional Insurance: Corporate & Transactional

InsureTech InsureTech

Financial Institutions Financial Institutions

Insurance (Class Actions) Insurance (Class Actions)

Insurance Regulatory Insurance Regulatory

Business & Commercial Disputes Business & Commercial Disputes

Finance Finance

Litigation & Dispute Resolution Litigation & Dispute Resolution

  • Insurance & Reinsurance

  • Insurance: Corporate & Transactional

  • InsureTech

  • Financial Institutions

  • Insurance (Class Actions)

  • Insurance Regulatory

  • Business & Commercial Disputes

  • Finance

  • Litigation & Dispute Resolution

Experience

  • Covid 19 : Advising international markets on all aspects of insurance and reinsurance issues arising from Covid 19, including “Perils” , aggregation and hours clauses
  • Covid 19: Appointed Global coordinating counsel for major underwriting entities’ Covid 19 exposures
  • Binding Authority dispute : Acting on dispute over waiver of Insurers rights by major international underwriting agency
  • Advising various ILS reinsurer entities on cedant’s collateral retention issues
  • Sale of Lloyd’s Underwriting dispute: acting in Commercial Court proceedings on accounting issues on sale of the Agency
  • New Zealand Earthquakes acting for Bermudan Reinsurer: Successful arbitration on aggregation of New Zealand Earthquake losses and interpretation of “cause” language and effect of extended expiration clause.
  • Guaranteed Annuities Reinsurance - International Reinsurer: Successful arbitration acting for a reinsurer on calculation of profit commission on performance of guaranteed annuities in the life sector.
  • Property Damage Losses - US Cedant: Successful recovery from London market reinsurers of property damage losses resulting from a defective building product. The case raised interesting issues on the operation of competing underlying insurances.
  • Liability Claims in Central America - Successful reinsurance recovery of personal injury losses paid for a large number of liability claims in Central America resulting from workers’ exposure to pesticides in the mid-20th Century.
  • Volcanic Ash - Acting for reinsurers in an arbitration concerning travel insurance losses caused by Icelandic volcanic ash eruption. Case involved analysis of extent to which volcanic ash was “bad weather”.
  • Broker Liability - Acting for a US insurer in a dispute with a London market broker who lost the slips proving the extent of the cedants’ reinsurance cover. The case involved issues such as broker’s duties to their clients, and the relationship between the producing and placing broker.

Related Insights

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Awards
Oct 16, 2025

Chambers 2026 UK guide ranks BCLP in 36 practice areas and recognises 76 individual lawyers

In the 2026 edition of Chambers UK BCLP received 36 practice area rankings and 76 individual lawyer recognitions. This year, the firm is recognized in six new practice areas and improved to a Band 1 ranking for Commercial Contracts, as well as a Band 2 ranking for Hotels and Leisure.  
Awards
Oct 17, 2024

Chambers 2025 UK guide ranks BCLP in 34 practice areas and recognises 74 individual lawyers

News
Jun 20, 2024

33 BCLP lawyers recognized in Best Lawyers in the UK ranking 2025

News
Feb 20, 2024

Chambers Global 2024

Insights
Feb 13, 2024

English Court decides Covid-19 is a “catastrophe”

The English Court has, for the first time, considered the meaning of a “catastrophe”, as well as how Hours Clauses work in the context of non-damage business interruption losses claimed under two Property Catastrophe Excess of Loss Reinsurance Treaties.  While the Covid-19 pandemic may feel like a distant memory to some, disputes about the recovery of Covid-19 losses continue to trouble many reinsureds and reinsurers.  The two key issues considered by the Commercial Court in determining appeals from arbitration awards made in Unipol Re v Covéa and Markel v Gen Re may bring welcome, and valuable, guidance to those in the reinsurance industry debating these terms. Those underwriting or purchasing “catastrophe” covers may also want to carefully consider this judgment and whether the Court’s approach to the meaning of that word aligns with their coverage expectations.
News
Oct 19, 2023

Chambers UK Ranks BCLP in 41 practice areas and recognizes 74 lawyers

Awards
Jun 08, 2023

BCLP lawyers recognized in 'The Best Lawyers in the United Kingdom 2024'

News
Feb 16, 2023

Chambers Global 2023

Insights
Oct 19, 2022

Reinsurance: aggregation of COVID losses post-Stonegate

Related Insights

Awards
Oct 16, 2025
Chambers 2026 UK guide ranks BCLP in 36 practice areas and recognises 76 individual lawyers
In the 2026 edition of Chambers UK BCLP received 36 practice area rankings and 76 individual lawyer recognitions. This year, the firm is recognized in six new practice areas and improved to a Band 1 ranking for Commercial Contracts, as well as a Band 2 ranking for Hotels and Leisure.  
Awards
Oct 17, 2024
Chambers 2025 UK guide ranks BCLP in 34 practice areas and recognises 74 individual lawyers
News
Jun 20, 2024
33 BCLP lawyers recognized in Best Lawyers in the UK ranking 2025
News
Feb 20, 2024
Chambers Global 2024
Insights
Feb 13, 2024
English Court decides Covid-19 is a “catastrophe”
The English Court has, for the first time, considered the meaning of a “catastrophe”, as well as how Hours Clauses work in the context of non-damage business interruption losses claimed under two Property Catastrophe Excess of Loss Reinsurance Treaties.  While the Covid-19 pandemic may feel like a distant memory to some, disputes about the recovery of Covid-19 losses continue to trouble many reinsureds and reinsurers.  The two key issues considered by the Commercial Court in determining appeals from arbitration awards made in Unipol Re v Covéa and Markel v Gen Re may bring welcome, and valuable, guidance to those in the reinsurance industry debating these terms. Those underwriting or purchasing “catastrophe” covers may also want to carefully consider this judgment and whether the Court’s approach to the meaning of that word aligns with their coverage expectations.
News
Oct 19, 2023
Chambers UK Ranks BCLP in 41 practice areas and recognizes 74 lawyers
Awards
Jun 08, 2023
BCLP lawyers recognized in 'The Best Lawyers in the United Kingdom 2024'
News
Feb 16, 2023
Chambers Global 2023
Insights
Oct 19, 2022
Reinsurance: aggregation of COVID losses post-Stonegate
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