All you need is class 1
http://www.quotea.co.uk/business/business-use-insurance-definitions.aspThis is usually just a small addition to a social and domestic policy - I have my motorbike insured class one and cost me an extra tenner
If your current insurer is unwilling or unable then try out a comparison site and select class 1 and see how you get on - but yes if you are travelling while working you need the policy to cover business use £200+ , 6 points and car uplifted aint worth the risk in my books