This comes after more than 500 Britons have left the UK to fight Jihad in Syria and Iraq.
The increase in the threat level is related to developments in Syria and Iraq.
A man has wagered £400,000 in what bookies say is one of the world’s biggest political bets.
The Prime Minister has so far taken a low-profile role in the debate on independence.
Govt officials initially said they were exploring all options with respect to the swap proposal.
Britain’s legalisation of gay marriage has now been put into effect.