The Guardian Fire & Life Assurance Co. was established in 1821. In 1902 the company was renamed Guardian Assurance Co. Ltd.
In the mid 1960s Guardian Assurance established a new base at Lytham St. Annes in Lancashire for its expanding life and pensions business.
In 1968 the company merged with Royal Exchange Assurance to form the Guardian Royal Exchange Group (GRE). In 2011 GRE was acquired by Cinven and now trades as Guardian Financial Services.