Chancellor George Osborne's expected to rule out the possibility of an independent Scotland keeping the pound when he makes a speech in Edinburgh later.
Nationalists say the UK government is bluffing and that a currency union is the best option.
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Scottish leader Johann Lamont's resignation highlights the post-referendum divisions.
Remaining windy in the west. Heavy rain on Sunday morning
A consultation is to begin in Melrose to look at the possibility of charging for car-parking all year round in the town's main car park.