Millions of Asian hornets have colonised swathes of French countryside . Vicious insects mutilate honeybees and prey on beehives to feed young . Six people have died in Britain after suffering allergic reactions to sting . Ministers in France have drawn up battle plans for any possible invasion .
Millions of Asian hornets have colonised swathes of French countryside . Vicious insects mutilate honeybees and prey on beehives to feed young . Six people have died in France after suffering allergic reactions to sting . Ministers in Britain have drawn up battle plans for any possible invasion .