Hi,
A Form 17 can only be used when a property is held in joint names. It is not clear if your property is in joint names or you have sole legal ownership. If it is in joint names then it is up to you/partner what bank account or type of bank account you want to use for rental income purposes;
HMRC do not advise or comment on this.
If you have sole legal ownership and the mortgage is paid by you then mortgage relief can only be claimed by you - your partner would not be able to claim this so in effect as you hold 0% beneficial interest no relief would be able to be claimed.
More information can be found:
TSEM9800 - Property held jointly by married couples or civil partners: contents
Thank you.