If you hear a telltale whine then spot this striped insect inching towards your arm, be very concerned.

For this is the Asian tiger mosquito, which can carry a host of potentially deadly diseases - and it could be heading our way.
The mosquito has already established itself in Northern Italy, where it has transmitted chikungunya fever to scores of victims.
It has also been detected in a dozen other European countries including Germany, France and the Netherlands.
Britain could be the next to be invaded, say scientists at the Government's Health Protection Agency at Porton Down in Wiltshire.
An HPA study warns that "widespread establishment" of the tiger mosquito across England and Wales is possible in the warm, damp conditions of the British summer.
Because the tiger mosquito lays its eggs in water, it is thought it could survive in small pools that collect in tyres sent to Britain on container ships from Asia.