Florin and Laurentiu Ionita were jailed for three years each after they admitted to 10 counts of conspiring to steal.
The duo were arrested in October as part of a police operation following the robberies and thefts that took place from August this year.
The Met said: “While Westminster Crime Squad will continue to target such offences in Westminster and beyond – we urge all members of the public to check the ID of all persons purporting to be in authority, be this police or people from utility companies.
“If you are concerned that they are not genuine then phone police immediately.”
The Met also issues advice to tourists, including: “Look as assertive as you can, walk with confidence and be aware of your surroundings and who is around you.
“Wearing headphones and talking on the phone can make you unaware of your immediate surroundings, this makes you appear vulnerable and gives an advantage to a criminal.
“If you feel uneasy about an individual or situation, trust your instincts and leave the area and head towards a public place such as a shop.”
"London is one of the most interesting and exciting capital cities in the world attracting millions of visitors each year," the Met Police says in its advice.
"It's also one of the safest.
"As in any large, busy city, however, crime can sometimes be a problem so you do need to take care about personal safety and looking after your belongings."
The police forces offers a breakdown in safety advice for those visiting the capital:
- Avoid leaving valuable in hotel rooms. Keep them in a hotel safety box or safe.
- Make sure rooms are firmly closed when leaving.
- Do not leave bags or valuables unattended in hotel lobbies.
Out and About:
- Keep bags and camera where they can be seen by wearing them on the front, not over the shoulder.
- Never leave bags on floors or on the back of chairs when in restaurants, bars, theatres of cinema.
- Keep to well let, busy areas when out at night.
- Avoid using stations in isolated places.
- Only use licensed taxis.
"Remember the police are there to help you," the Met state in its advice.
"If anything does go wrong and your possessions are lost or stolen then contact the police at the earliest opportunity."
Florin Ionita, 31, and Laurentiu Ionita, 47, both of no fixed abode, used fake warrant cards to search Chinese tourists while pretending to be plain clothes officers.
The Met says an officer carrying out a stop and search much give certain information including their name and the station where they work, the law under which you have been stopped, your rights, and why you have been stopped.
They must also show a warrant card or give their identification number.
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