I was paying £1,800 3rd party with adrian flux. I never actually payed that much as I changed my car near the end of the year but that was the renwal quote.
The car was a moded Rover 620Ti (+200bhp, IG18) I'm 23 with 3yrs NC and no points.
So after shopping around I managed to get a traders policy for £650. This allows me to drive any car, bike, quad, HGV, PSV, moterhome, kit car and prety much anything with a engine and wheels. There are no limitations on power, cost or mods. I don't have to be the owner or keeper, I just need their permission to drive it. It also covers my own car for personal, domestic, social, business and pleasure. As well as my GFs. And anyone can drive any car I own for demonstration puposes.
However that is only 3rd party.
Obviusly you do actually have te be a motor trader to qualify! But I've started buying and selling Clios and it's more than payed for the policy.