FOS have published a list of the insurance companies and brokerages that they have received complaints about together with the number of new cases and cases closed as well as the case outcomes, for the last 12 years. Some companies stand out from he crowd by a long way ! Very useful information. 4298 firms are listed !
The info. is in an excel file and it’s is quite large and could take a while to load. It has several sections and pages so you need to look around. The columns can be sorted after a fashion. The page of outcomes has a completely different layout.