Top up from you account via bank transfer - then you can top up £123.45p!
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You should have added ‘YET’ at the end of your sentence! 
Not sure how much you are following Monzo news, but Monzo&Current accounts are slowly being rolled out, so this functionality will be available for all users in nearest future.
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There are currently ~1,700 current accounts: https://monzo.com/current-account/live/
It was half that number a week or so ago
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