This has nothing to do with the banks. It has to do with the market. Whatever happens, people will drive their cars, so there is a demand, so the price goes up. Insurance costs are getting higher and higher because people claim more and more - sometimes illegally.
There isn't anything you can do except give up your car. Or, you can be like me - old, boring car, 20 years NCB and paying £290 for fully comp, legal insurance and protected NCB. Sometimes there is reward in old age!!
It's called the free market, and you all love it when you get stuff cheap from overseas or on comparison websites. We live in an age where everyone knows the price of everything and the value of nothing. If you live by the God money, you die by it. Suck it up guys!!