Welcome to the Community Forums! Thank you for your first post.
I'm afraid that we can only have one named person as the account holder for security reasons. However as long as your Wife knows the memorable account word and can pass security when speaking to us, we will be able to help with most things, such as faults and general account queries. We just wouldn't be able to make any major changes on the account, as we'd need to speak to the account holder for this.
Sorry for any inconvenience caused, but I do hope that the above helps 🙂