Are Westpacâs Chinese walls too flimsy for a solid defence? The bankâs defence of the regulatorâs blockbuster insider trading case will likely succeed or fail on the strength of its internal information barriers. May 11, 2021 â 4.27pm Save Share It is said you can see the Great Wall of China from space, such is its scale and solidity. But could you say anything similar about Westpacâs Chinese wall? Itâs one question that will be bouncing around the heads of Westpacâs top legal eagles as the bank ponders whether to defend the corporate watchdogâs allegations that it engaged in insider conduct.