function isValidPostcode(p, andalert) {
    var postcodeRegEx = /[A-Z]{1,2}[0-9]{1,2} ?[0-9][A-Z]{2}/i;
    var result = postcodeRegEx.test(p);
    if (andalert && !result) {
        alert("Please enter a valid UK Postcode");
    }
    return result
}