The tiny red and black bug first appeared in the Natural History Museum's Wildlife Garden in March 2007. Since then it has become the most common insect in the garden and has also been spotted in Regent's Park and Gray's Inn. The bug appears to be harmless, but there is potential for it to spread throughout the UK, said experts...

Despite containing more than 28 million insect specimens, the museum failed to find an exact match for the new bug. Experts said it closely resembles the rare species Arocatus roeselii that is usually found in central Europe. But the roeselii bugs are brighter red than this new bug and they are usually associated with alder trees. The National Museum in Prague discovered an exact match to the mystery insect but experts there have also failed to determine exactly what it is. "It seems strange that so many of these bugs should suddenly appear," said Mr Barclay.