It's quite clear really, the following is on the receipt they email you:
If your order includes any of our Month Passes, they’ll roll on each month at the standard price, unless you cancel. Check out the T&Cs below to see what you’ll pay.
If you’re on an offer or a free trial, you’ll start paying the regular price when your offer or trial period ends. To see details of exactly what you’ll be charged and when, log in to My Account and head to Passes & vouchers.
If your order includes any of our Month Passes, they’ll roll on each month at the standard price, unless you cancel. Check out the T&Cs below to see what you’ll pay.
If you’re on an offer or a free trial, you’ll start paying the regular price when your offer or trial period ends. To see details of exactly what you’ll be charged and when, log in to My Account and head to Passes & vouchers.