Sending medical evidence late UC

Hi everyone,

I have helped my husband fill in a UC50 form. He kept putting off filling it in so we did not have time to get a supporting medical letter. The form was posted last week and was received on time. We now have a letter of support. My question is how do we go about getting it to the correct department. We are in Northern Ireland? Do we send it to the same address as was on the form and ask them to attach it to his UC50?

Thank you for any advice on this.
Jessica