Two of Hillingdon Police's longest-serving volunteers got an award from Boris Johnson to celebrate the achievements of Met volunteers in the borough.
Over 10,000 hours were contributed in Hillingdon last year, the highest in London.
The award was received by Roger Maxwell and Ken MacGregor.
Mr Maxwell has been a volunteer since 2002. He was the borough's first to open front counters at its volunteer police stations, and has been reponsible for recruiting, training and mentoring many volunteers.
He is based in Ruislip Police Station, while Mr MacGregor, who has served for 13 years, volunteers in Hillingdon and is the chair of the neighbourhood watch scheme.
Chief Inspector Maurice Hartnett said: "I think its fantastic that members of the public give up their time freely to help deliver our service. This award reflects their commitment."