Earlier this month, detectives searching for Madeleine McCann ruled out the key sighting that underpinned the original Portuguese investigation and released e-fit images of a different man they wish to speak to who was seen carrying a child on the night she went missing.
Thousands of calls have been made to police in both the UK and across Europe following the recent appeal.
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Sex and drugs are off limits for undercover police, official guidelines published for the first time state.
Nicola Sturgeon will hold talks with European Parliament president Martin Schulz in Brussels today.
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