Police took bicycles off passing cyclists to help them run down a suspected criminal in Cambridge on Monday.
Officers were following a man who had threatened staff at Marks & Spencer by patrol car, but were at risk of losing sight of him.
So they hailed two members of the public, borrowed their bikes and hot-pedalled it to catch the man and make an arrest.
Sgt Nick Ashton-Jones, one of the officers who gave chase, told the Cambridge News: “This was an incredibly selfless and public-spirited act.
“My colleague and I may not have caught up with the man had it not been for these two members of the public and I'd like to tell them how grateful I am.”
Both bicycles were returned to their owners and a 35-year-old man from the Cambridge area was arrested on suspicion of theft and possessing an offensive weapon. He has been detained under the Mental Health Act.
After an unpromising start, having to be bribed by her parents to learn to ride without stabilisers, Sarah became rather keener on cycling in her university years, and was eventually persuaded to upgrade to proper road cycling by the prospect of a shiny red Italian bike, which she promptly destroyed by trapping a pair of knickers in the rear derailleur. Sarah writes about about cycling every weekend on road.cc.