British cybersecurity startup Darktrace is planning to make its London stock market debut in a reported bid to raise £3bn, but storm clouds linger overhead.

Darktrace is one of the UK’s most prominent tech startups, having raised more than $230m in funding to date and reporting $199.1m in revenue last year. However ongoing fraud allegations against former Autonomy boss Mike Lynch, whose investment trust is Darktrace’s founding shareholder, could cause a stir among investors seeking a slice of the pie.