The Treasury and Scottish Government have clashed over whether Scotland should keep the pound if the country votes for independence.
Chancellor George Osborne said: "I want the best for Scotland and for all our United Kingdom. We're better together."
Scottish Finance Secretary John Swinney said Scotland could walk away from its share of the UK's debts if the Westminster government refuses to come to "a rational and considered agreement".
Debi Edward reports:
More top news
Given how dependent the rest of world is on China, it's $33 trillion debt could affect the UK - and here's why.
"Their fictitious state has fallen," an Iraqi military spokesman said after forces were said to have recaptured the landmark mosque from IS.
The sister of one of the Hillsborough victims said her father made her promise to "get truth and justice" on his deathbed.