One password is believed to have been all it took for a ransomware gang to destroy a 158-year-old company and put 700 people out of work.

KNP - a Northamptonshire transport company - is just one of tens of thousands of UK businesses that have been hit by such attacks.

Big names such as M&S, Co-op and Harrods have all been attacked in recent months. The chief executive of Co-op confirmed last week that all 6.5 million of its members had had their data stolen.