For someone who isn't ancient, but whose first car insurance was Β£193, I find these prices absolutely and utterly crazy.
If you don't live in a high-risk area, then there's clearly something which is pushing this premium way, way up. Apart from the obvious (i.e. I assume you don't have any motoring convictions), then what insurance group are these vehicles in? Maybe the cost of the car (being quite low) is a factor - sometimes it can look like a cheap car is a car you're not going to care much about and you become viewed as more of a risk. Have you selected the correct use class, i.e. SDP & C, not Class 3 business use or something? Finally, the cars haven't been modified, imported, cat C/D write-offs? All those sort of things.