This article refers to payment via PayPal.
Your PayPal arrangement needs to be cancelled directly with PayPal. The easiest way to do this is to login in to your PayPal account online and from the My Account tab, amend your Pre-Approved Payments.
When a PayPal arrangement is cancelled your payment priority will also be updated on our systems. To view and amend your Payment Priority, login to your 123-reg Control Panel.