CAP Law of Birmingham, specialise in Professional Negligence Claims. They help businesses and individuals throughout England and Wales to recover compensation for financial losses caused by negligent professionals, such as solicitors, surveyors, architects, financial advisers and insurance brokers. There is useful information on the site on all these topics.
MHHP Solicitors of Barnet, provide a very useful guide on How To Identify Grounds for a Professional Negligence Claim. This describes what a Professional Negligence Claim actually is, the kinds of professionals that can be claimed against (although not an exhaustive list), common resolution routes and details on how the process works, complete with commonly asked questions about funding a claim.