Anonymous British blogger becomes accidental hero by putting brakes on global cyber attack for just £8 as 'atom bomb of malware' cripples NHS, halts car production and hits more than 100 countries
UK blogger, 22, 'accidentally' found method to block spread of cyber attack
He found way to register virus as a website which caused a 'kill switch'
But he warned the code could be changed and urged users to update systems
'Unprecedented' attack has crippled the NHS and cancelled operations
Home Secretary unable to confirm whether any patient files have been lost
More than 130,000 infections have been detected across 100 countries
Experts say affected computers being used as 'zombies' to spread virus and the attack could be 'only just beginning' with fears of a second wave
By Joseph Curtis For Mailonline
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