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When are you looking to buy?
That should be your #1 question*.
Lots of people have 1yr lock in savings accounts, like 1st Direct @3% - turn it into a joint account and you can both have a savings account. NW as mentioned is good, TSB has a variable rate which isn't amazing anymore, but is better than nothing and has no lock-ins.
Basically you need to go through MSE and work out what combo of accounts you and your Mrs can open.
*TBH investment horizon should almost always be the 1st question to any investment decision).
I thought as much. Any recommendations for savings accounts? We've got a lump saved we could use to set up direct debits in to various accounts.