Adding a French national to a UK joint acccount

Has anybody had any experience with creating a UK joint account with a French national?

My partner will be eligible for a survivors pension when I die which I understand can only be paid into a UK bank account. I have a couple of accounts in the UK (I am tax resident in France) and before I tackle the bank I wondered whether anybody on here has managed to either open a joint debit bank account or added a French national to an existing account? We are pacsed which may help.

Thanks in advance.