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I am aware of this as a great source for UK postcode outcode border data as KML. Unfortunately, uk postcode outcode border data for the Isle of Man (IM -> IM1, IM2 ...) and Northern Ireland (BT -> BT1, BT2 ...) are missing.

Is anyone ware of any other free data sources of UK postcode outcode border data - ideally as KML?

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NISRA (Northern Ireland Statistics and Research Agency) owns the data for Norther Ireland postcodes. You will need to sign their memorandum of agreement to download it and use it:

https://www.nisra.gov.uk/support/geography/central-postcode-directory

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