If he puts the real address with the real post code that he signed up with and removes the other, then its possible it could possibly lift the limits, i don't think he has anything to lose the doc request will stay if it does not work.
Isn't everything risky from here on in on this account ?
All i know is i have done similar recently and the id request went away
i had the same address twice on a pp account but the postcode was joined on one, i removed the address with the joined posted code and the id request for the 1900 limit went away.
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