CH31 Heswall, Wirral Postcode district CH31: 2 named streets and 7 live postcodes, in Wirral. Streets Pensby Road, Heswall Telegraph Road, Wirral Postcodes CH31 9ES CH31 9FD CH31 9FU CH31 9GF CH31 9GN CH31 9GT CH31 9GW Source: ONS Postcode Directory (live postcodes only) and OS Open Linked Identifiers for the streets.