Our premiums are calculated based on a number of factors, commonly referred to as rating factors. For example age, gender, driving experience, and style of car are all rating factors for car insurance. Some customers may pay more or less for their insurance policies than others, based on the claims statistics we hold for their varying rating factors.
We've observed a link between payment frequency and the likelihood of making a claim. As a result, payment frequency is also one of the rating factors used to determine your premium.
You can find this information, along with some additional terms here. You can also find more information about what influences our premiums here.