A self-styled Scottish separatist has failed in an appeal against his conviction for sending two hoax bomb threats against transatlantic flights departing from the United Kingdom.

A 61-year-old Scottish man has been sentenced to four years for sending two hoax bomb threat emails to Heathrow Airport purporting to be from the Scottish National Liberation Army.

Anti-terrorist officers in Britain were today hunting extremist Scottish nationalists who sent aromatherapy oils containing caustic soda to 10 Downing Street.