Please remember, a police officer would never ask you to withdraw money and give it to them.
They would also be able to meet you face-to-face and show you ID, and would be happy for you to verify their credentials by calling 101.
If you receive a suspicious phone call then please hang up the phone and report it. Don't feel worried about appearing rude, it is better to be safe than sorry.
Download the infographic Scam Alert Advice