The payment for the first month of the base liability insurance policy is made in advance - if you purchase the policy on February 1st, and the contract begins straight away, you’ll pay the first fee directly on February 1st. A contract is created alongside the first payment. For every extension module, you’ll pay on the date on which the payment for the base liability module is due to recur. (Your protection will still be valid from the day following the purchase.) Following on from the above example, if you add on the drone extension module on February 15th, your payment on March 1st will include the basic liability cover, the drone module for the following month, as well as a pro rata payment for the drone module from February 15th to March 1st.