I'm with a solicitor that's a win no fee from my car crash! They take 25% off the compensation which is actually quite alot :/ but it all varys on who you go with
My husband used one after a car accident he was in. We didn't pay them anything but they took a chunk out of his compensation settlement from the other drivers car insurance. It's was quite a bit too. I'm not sure if they're all the same but if you're using on I'd defo read all the fine print and learn up front what percentage they intend to take after a win.