Yes, you will be asked to provide bank card details to validate your trial and set up your account as part of the sign-up process, but nothing will be charged to your card until the end of the 30 day free period. Clearly no payment will be taken if you cancel your trial before the end of the 30 day free trial period.
Once your account is set up you can switch your payment method to monthly direct debit.
Sign up now. It takes less than 1 minute to get started.