Scotty those companies:

a) are the same!
b) are hopeless unless you are collecting your giro!

Give these people a try, and start with Direct Line.
Also, whilst I'm here, why are you saying 18k miles to them? They only ask for an estimate (it's not a commitment) and unless you say less than 7k miles they don't make you sign a mileage limitation contract. Saying 18k you are just sticking a beacon on your head. Also, how are you protecting your NCB's? You need 4years+ for that don't you?

Direct Line!!

www.directline.co.uk - Obviously very good, prefer Fords to Vauxhalls.
www.endsleigh.co.uk
www.tesco.co.uk - Very good
www.elephant.co.uk
www.esure.co.uk
www.egg.com
www.cis.co.uk
www.rac.co.uk - Surprisingly good quotes.
www.theaa.co.uk
www.morethan.co.uk
www.cia-insurance.co.uk
www.axamotor.co.uk - Love Vauxhalls, not so keen on Fords
www.expressinsurance.co.uk
www.insureyourmotor.com
www.sureterm.co.uk
www.eaglestardirect.co.uk
www.prudential.co.uk
www.belldirect.co.uk
www.privilege.com
www.confused.com
www.quotelinedirect.co.uk
www.liverpoolvictoria.co.uk