Hi,
You do not need to complete the Form 17. You need to write & sign a Trust Deed.
However most types of trusts giving an interest in property to somebody who is not the legal owner now need to be registered with HMRC via the Trust Registration Service.
You can find guidance on the registration requirements and how to register here:
Register a trust as a trustee.
There’s also more information about what type of trusts need to be registered at:
TRSM23050.
Your husband will have to either write in to advise HMRC of his property income or register for self-assessment depending on the level of property income that he expects to receive.
Guidance on self-assessment criteria can be found here:
Check if you need to send a Self Assessment tax return
Thank you.