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Thus the extents will need checking when a new edition of the OS data isprovided. It is advisable that the extents include an additional field to indicatewhether the data has been validated against OS line work. This allows theCustodian to easily identify extents that need reviewing.A7Royal MailPostcodes as contained in the LPI record many not are allocated by theRoyal Mail until the premises has been occupied. At present the allocation<strong>and</strong> publishing of postcodes for new premises is rather patchy. TheCustodian will need to devise a method of flagging postally addressableaddresses which have not yet been allocated postcodes so these can beregularly reviewed.Version : 4Date: 18/02/05 Page 37