deeds

[Inkpen]

how can i put my partners name on the deeds but not on the mortage

[dzug]

You can't.
Or at least you shouldn't be able to. Some lenders aren't too fussy these days.

[Loosehead]

deeds are irrelevant.

You may be able to add your partner to the land registry entry if the lender agrees but they probably won't unless he also takes joint responsibility for the mortgage. They may allow it if there is sufficient equity.

[Nether Edge]

loosehead is wrong: one can be a joint owner but indemnified against mortgage, or - conversely - a borrower without being a mortgagor (or vice-versa).
Take proper legal advice, like the forum disclaimer recommends.

[bianca1]

Yes Nether Edge is correct, contact the closing attorney and they will point you in the right direction.