Emma,
You've probably heard of the
pay as you drive insurance scheme which was launched by Norwich Union where you pay per mile you've driven. Unfortunately, this type of insurance is no longer available now. The alternative is to get pay per month insurance. So instead of paying insurance for a year, you pay for a month at a time which means that you can cancel the insurance if you no longer require it after a month's period. Please check
eCar Pay As You Go Insurance for a quick quote and more information and see if this one fits into your requirements.