the way i do it every year is to just go through the comparison sites, its a total waste of time for me to phone all individually, especially the smaller boys.
Kwikfit phone me every year and i explain there is no point wasting my time on the phone with them.
I'm 24, 6 yrs no claims. for 20Vt plus, ive got 800 quid is the best quote. third party fire/theft.
I can't see the point of drivers under the age of 26 going fully comp (unless it's cheaper obviously) as we would never make a claim anyway.
Try moneysupermarket.com/gocompare/confused. Directline is not listed on the comparison sites, as is aviva (Norwich Union).
Like the above comment, add named drivers is so easy to do. And, i think confused, on the end page with all the quotes up, you can simply tick/untick the named drivers individually and see which combination comes out as the cheaper.
It's not illegal, just playing the game

good luck