Dirk jan You wouldn't see it on a physical card because all cards are strictly personal (but they can be connected to Joint accounts of course).
In order to see the co-owners of a Joint account, go to the Home tab, then tap on the account you're interested in. Now open the Settings on the top right. Choose the second option from top "co-owners". And that's it. A list with all co-owners.
Alternative, you can click on the More button after tapping on the account, then choose "Export statement" and create a bank statement in PDF format. This will also list all co-owners at the top.
