University transfer help

I am currently retaking a year at the University of Portsmouth, focusing on three modules. However, I don’t want to continue my second year of studies here. I have researched other universities that accept transfers, and my plan is to reach out to them via email to inquire about the possibility of transferring. In the email, I'm wondering whether to mention that I am repeating the year due to extenuating circumstances or not include this.

Thank you to anyone who gives any information