Hi have you tried :
carole nash,
0800 298 5500.
I know im older then yourself as im (40) but this is the first car i have insured as had always driven company vans for over 10 yrs,so had no no claims,and was getting qoutes over ?500 for third party,carole nash insured me for fully comp ?185.10,its a free phone number so you got nowt to loss, give them a try,
good luck.