Euro Direct (01274 737 144) has launched a CD-Rom containing the complete electoral roll, - 46 million adults in 24 million households. Access to this massive database has, until now, been available only to companies with a mainframe computer. However, the data which normally occupies 13 gigabytes of disk space has been compressed to a mere 750 megabytes, making it compatible with an ordinary desktop PC. Using Euro Direct's RollCall Systems software, clients can search, capture and output information from the electoral roll for mailing purposes. The company claims that its CD is more comprehensive than the Royal Mail's PAF database.