Technology, you can’t live with it, you can’t live without it. Unfortunately, millions of users around the world have come to realise the latter over recent years due to a series of spectacular, and thoroughly unwelcomed, failures. Software failures have wreaked havoc at banks, airlines and the NHS, doing billions of pounds of damage and devastating disruption. We've taken a look back at what went wrong during some of worst software failures in the history of the UK.