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The space is casually ignored by customers. It doesn't really matter, and won't cause any delivery / billing issues.
Other option is formatting the postcode input to contain the space. (The second part after the potential whitespace is always [0-9]{1}[a-zA-Z]{2}, so it's 100% safe to insert the whitespace before this part, if it's missing.)
Or as a final option, make the validation error clear. (you missed the whitespace)
This change makes the whitespace optional.