try brentacre insurance services, they're mega cheap and do modified car policies cheaper than anywhere else.
this insurance business is a complete con! your occupation makes a difference to the cost even if its only insured for social domestic and pleasure. I had it out with my company over needing to put my mum on mine just in case she needed it. They said because im self employed it is more expensive even though i am not insured to use the vehicle for commuting to a set place of work, and my policy does not cover business use in any way so im not allowed to use the car for anything relating to work... i just do it all in the van.
also, get this, they said because im self employed and my mum is retired we are more likely to have more time in which to use the car, and so it would be more expensive. Even though the annual mileage is a set figure that i aren't supposed to go over! lol.
insurance is ridiculous nowadays because of the rising number of people claiming injury in accidents and the amount of uninsured drivers on the road. The government is trying to combat this by that new thing they are bringing in by fining people who own and tax an uninsured car, by saying that it should be sorn if it does not have any valid insurance. i think they were on about capping insurance costs for people 25+, which would be good but wont help me for a few years yet.