This article will explain what happens to your domain name’s 123-reg Parking when the domain name is no longer in your account.
If your domain name is cancelled, or expires, your 123-reg Parking will no longer be available. If you choose to reregister the domain name, you will have to set up your domain name parking again.
If you transfer the domain name to a third party, again, your parking will be unavailable.
However, if you transfer your domain name to another domain registrar, you can still keep your 123-reg parking, but only if you do not change the Nameserves on the domain name.