Only ones who would quote me were Greenlight and Sky Insurance, due to a high risk named driver (26, but only had licence for 2 years). Both very similar on price, but Sky went above and beyond what i would normally expect from an insurer in terms of actually wanting my business and the level of cover offered.
They insured my Stage 2 FR, all mods declared and covered like-for-like, with my 'suposedly' high risk named driver, for less than the comparison sites would quote me on a standard FR
Best advice anyone can give you is to start with the comparison sites, then get quotes from the specialists. Most allow you to submit your details online nowadays anyway, so you don't need to go through the same details when speaking to each broker.