tip-off

Following tip-offs from women and from bar staff concerned about the scheme's implementation, BBC researchers posed as a couple on a date to test venues that actively promoted their involvement.

Following several tip-offs, London Zoo bird-keepers headed to the home of a family in Buckden, who had searched online for missing bird reports after spotting the macaws resting in trees in their garden.

Over several weeks, the BBC visited dozens of food establishments in east London, following tip-offs that deception about ratings in the area was rife.

He was only caught after uploading a clip in which he tortured at least eight dogs - all except one were puppies - which was passed on to NT police in an anonymous tip-off.

The Clarkes' ability to capture United's Christmas party - usually via a tip-off from a local contact - apparently set conspiracy theories running among the squad.