Why Collaborate With Costero?

If you have a “standard risk,” finding coverage can be achievable. The problematic accounts, however, are proving more challenging. Maybe they are in a unique or emerging industry with unconventional exposures or an untested track record. For a myriad of reasons, underwriting these types of clients is exacting. It is often these issues which lead clients to Costero for innovative ideas and creative solutions.

Who are we?

  • A place where you can discuss all your insurance requirements.
  • A team of problem solving brokers. Our team will seek out capacity on complicated to place accounts providing bespoke coverages where others do not have the expert knowledge and market relationships.
  • A thoughtful organisation you can count on with a team dedicated to you and your company.

When you are running out of options and need to find a way, collaborate with Costero. We will help you through your more challenging placements and find long term risk management solutions.

Wouldn’t it be nice to have Costero on your side?


We have a dedicated, dynamic team of broking, technical and claims professionals offering expert service across a range of product classes and disciplines.
John Tallarida

John Tallarida


John began his insurance career in 1986 and has enjoyed a long career on both the underwriting and brokerage side of the insurance business. He was fortunate to begin trading in the London marketplace in 1994 and immediately appreciated the broad capabilities of Lloyds of London.

John serves on the board of various insurance organizations and companies and currently serves as Director of the Costero Board.

+44 (20) 8054 9390


Nick Murrell

Nick Murrell

Managing Director

Nick has worked at Costero Brokers since its inception in August 2017. Nick has over 36 years’ experience in the London insurance industry, specializing in property, business interruption and contingent business interruption. Nick’s client handling and placement experience covers a broad range of industry sectors, which he has supported through program design, bespoke policy wordings, capacity management, claims management, and alternative structures, including captive design and establishment. While primarily focused on the US markets, Nick has experience in Caribbean, LATAM, Africa, MEA, APAC and Europe business.

+44 (0)7980 982 585

+44 (0) 207 337 6561


Jamie Webb

Jamie Webb

Executive Director

Jamie started his career at Rattner Mackenzie in 2005 who at the time were owned by Houston Casualty Company. He then moved to the Bermuda office where he served nearly three years. He then spent some time in Rattner’s New York office. Jamie left Rattner Mackenzie to form Prospect Brokers in 2010 and was designated Insurance Day’s Young Broker of the Year in 2012 in recognition of his work at Prospect. Jamie was appointed Managing Director of Prospect in January 2015. He sold Prospect to Costero in 2020 and is now Executive Director at the firm.

+44 (0) 7540 969 940

+44 (0) 20 8051 5150


Stuart Freeman

Stuart Freeman

Director, Head of Energy

Stuart Freeman started MarRisk Energy Services after a 17-year career in the London market, including working at Bradstock Blunt and Crawley and JLT Re, where he worked on accounts varying from facultative reinsurance of worldwide markets and accounts to insurance of multiple National Oil Companies. Stuart has enjoyed over 28 years of experience in the Upstream / Downstream insurance, reinsurance facultative and treaty markets. He also has a number of years’ experience with regard to the developing renewable markets.

+44 (79) 6775 0177


tom hughes 1

Tom Hughes


Immediately after graduating in history from The University of Liverpool in 1998, Tom began his professional career at international accountancy firm Mazars where he qualified as chartered accountant. He then held several senior finance positions in the London Insurance Market on both the distribution and broking side before in 2010 joining one of the largest independent Lloyd’s brokers, Alston Gayler, as CFO. Here Tom was part of the leadership team that drove through significant growth before the business was successfully sold to Miller Insurance Services at the end of 2018. Tom joined Costero in 2020 and sits on the boards of both Costero Holdings and Costero Brokers.

+44 (0)20 3743 3810

+44 (0)20 8051 5100


Jessica Knowles

Jessica Knowles

Director of Operations

Jessica holds over 12 years of experience in the insurance industry, encompassing various roles within both large and small broking houses. In 2018, Jessica joined Costero as its second employee, assisting in setting up licenses, policies, and procedures. She successfully helped registered Costero as a Lloyds broker and now oversees its operations, ensuring smooth project execution. Jessica also represents the company on the Board of our charity partner, IICF and leads the companies ESG committee.

+44 (20) 8054 2351


Barbara Small

Director of Compliance

+(44) 7736 346 560