Here is some useful information from the National Cyber Security Centre in relation to today's IT outage.
In response to today’s IT outage which has caused significant global disruption, we have published this statement, including advice on how to defend against phishing attempts⬇️ While we assess the outage was not the result of a cyber attack, an increase in phishing attempts since the incident occurred has been seen, as opportunistic malicious actors seek to exploit the situation.