A TV licence email scam has led to more than 5,000 complaints over the past three months.
Cyber crime monitor Action Fraud said fake TV licence emails regarding payment issues had been sent out to try to collect bank details.
The number of reports has increased in each of the past three months, with 1,805 complaints in December alone.
Action Fraud told the BBC the scam was "particularly nasty as it looks so convincing".
The emails use headlines such as "correct your licensing information" and "your TV licence expires today" in an attempt to convince people to click on the link in the email.
Action Fraud said it received 5,057 complaints about such emails between 1 October and the end of December.
Here is a typical example (one that I received myself). Look out for poor spelling or grammar, dodgy sender addresses, dodgy URLs, etc.