Cyber attacks on UK law firms climbed by nearly 20% between 2014-15 and 2015-16, according to new research that found that 73% of the UK top 100 were the target of attacks last year.

The prevalance of cyber attacks has now grown by more than 60% in two years, according to PwC's 25th annual Law Firms Survey, with the number of top 100 firms experiencing an attack rising from 45 in 2013-14 to 62 in 2014-15, and 73 during the most recent financial year.