I too have been with AdrianFlux for many years with my Celica GT4 & Celica Convertible. The prices have been a bit more expensive than other companies, but due to loyalty I've always stayed with AdrianFlux.
When I got my ISF (import), I obviously went straight to AdrianFlux, called rather than try online, only to be told that all the companies the deal with do not insure the ISF, let alone an import!
No point me staying with AdrianFlux anymore, on renewal of my Celica, I'll find cheaper and be loyal to me rather than an insurance company.