Met Police advice (24 March 2020):

We have heard reports that individuals may be taking advantage of the vulnerable by posing as door-to-door Coronavirus testers in order to gain access to people’s properties. Nobody, and specifically neither the NHS nor the Police, are conducting such tests.  If anyone attends your property and claims to be conducting such tests please call the Police on 999.

Unfortunately, there are some people who will try to cash in on people’s vulnerability at a time when they may be distracted by concerns regarding the coronavirus. It is worth taking time to make sure you are protecting yourself and your family from those hoping to take advantage of this situation. Fraudsters may well exploit this unprecedented situation to prey on others. They may try to target those assisting vulnerable people or those in self-isolation, sending coronavirus-themed phishing emails in an attempt to trick people into opening malicious attachments or revealing personal and financial details, or even coming to people’s houses to try and target them in person.

The advice around fraud and cyber-crime has not changed because of this virus. The most important thing to remember is if you are contacted by someone you don’t know, either in person or online exercise caution and if something doesn’t feel right then it probably isn’t. If you can’t be sure, check with someone you trust, or the Police. If someone knocks at your door claiming to be from a company or organisation, first check their ID. If you’re not happy, don’t let them in. Ask the person to wait outside, shut the door and contact the organisation by using a trusted method. If they’re genuine, they’ll understand.

The Met has a range of advice on how to protect yourself from fraud, which can be found here:- https://www.met.police.uk/advice/advice-and-information/fa/fraud/personal-fraud/