If you choose the monthly subscription package (£12.99 for 1 month), you will get a 7-day free trial. The full amount payable for the monthly subscription package will be debited from your account at the end of the free-trial period, unless you have previously cancelled your subscription.
If you choose a different subscription package, there will not be a free trial and the full amount payable for the subscription package you select will be debited from your account as soon as you subscribe.