Recently into class with an Ovi with Carbon Rig, I did a trawl of all available ones I could find incl, Noble, Bishops Skinner, Navigators and Gen, Newton Crum etc. and got wildly varying quotes from £75 to £220. Most do give allowance for No Claims so long as you can provide evidence and also some give discount for such as RYA membership and being a Dinghy Instructor. Not aware of any have a deal with Phantom class association that you find in some other classes.
The £75 quote was an excess of £30 generally and £100 on carbon spars.