Hi craftedbyjeffreydriver, thanks for your post.
If you are using eBay/Packlink, you can use available funds. However, for Royal Mail, PayPal is the only option available, which is why you are only seeing that one option only.
Thank you,
Marco
Did you find your solution? Help other members by marking your problem as solved. Simply click on "Accept as solution" for the answer that helped you.