* feat: process postcode changes to clear la etc when uprn errors clear values * refactor: how_fix -> how_to_fix * feat: explicitly blank uprn * feat: add uprn to error mapping * refactor: typos * refactor: cleanup * feat: make postcode secretly optional, same as lettings * test: update * test: add main tests * feat: remove unneccessary assignement * feat: add fix choice error message to sales * feat: typo fix * refactor: lint
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