To ask the hon. Member for North Devon, representing the House of Commons Commission how many and what proportion of computers on the House of Commons part of parliamentary estate have been found to be infected with malware in the last 12 months. (275670)

In the past 12 months 86 per cent. of computers on the estate have been attacked by malware, 78 per cent. of which were cleaned automatically by Parliament's anti-virus software, with 8 per cent. needing a visit by an engineer. There are 4,991 computers on the estate.