Postcodes must conform to the following rules:- The total length must be 6,7, or 8 characters, a gap (space character) must be included The inward code, the part to the right of the gap, must always be 3 characters The first character of the inward code must be numeric The second and third characters of the inward code must be alpha The outward code, the part to the left of the gap, can be 2,3, or 4 characters The first character of the outward code must be alpha Postcode: