6.5 If the Bank is satisfied that all liabilities owed by the Borrower(s) to the Bank have been irrevocably paid in full and that all facilities which might give rise to such liabilities have terminated, subject to the Bank’s right to retain any guarantee or security provided to it for such period as the Bank considers (in its sole discretion) necessary, the Bank may, at the request and cost of the Borrower(s) or the relevant guarantor and/or security provider, release, reassign or discharge (as appropriate) such guarantee or security.