Free PHP UK Postcode Validator

Do you require a free php postcode validator? Postcodepal offer an accurate "district level" validator which uses an included xml file. It can format the input postcode to the legal format even if a space has not been entered and can also break up the postcode into area, district, sector and unit. British forces and special postcodes are supported too and absolutely no database is required. This is the strictest validation can get without a database.