Square Pegs is a trading name of Castel Underwriting Agencies Limited (Castel). Castel is part of the Arch Capital Group and is a Managing General Agent (MGA) providing innovative insurance products, underwritten by our insurance providers, to UK-based insurance brokers and their clients.

Castel is authorised and regulated by the Financial Conduct Authority.

It’s registered in England and Wales under company number 07774336, with its Registered Office at 60 Great Tower Street, London, EC3R 5AZ.


Stuart Dickinson, Underwriter Square Pegs

Stuart began his career in insurance with the Guardian Royal Exchange in Croydon in 1985. Since then he has worked in a variety of underwriting roles, both in the company market and at Lloyd’s. Prior to founding Square Pegs, Stuart was Head of Commercial at Chaucer Insurance. Stuart is a Chartered Insurer and Associate of the Chartered Insurance Institute.

Castel resources

Castel has an extensive range of infrastructure capabilities, including experienced regulatory, compliance, accounts and support functions.

Can Square Pegs deal directly with the public?

No. We only sell via insurance brokers and not direct. Your insurance broker will provide you with help when you need it, look after your needs and protect your interests.