ROYAL Bank of Scotland has increased the size of stake it is selling in United States bank Citizens Financial after strong demand from investors.

The move means RBS could be in line to net up to £2.5 billion.

Earlier this week RBS said it would sell an initial 115 million shares with the possibility of 17.25 million more being made available.

But it has now confirmed 135 million will be going on to the market while an additional 20.25 million could also go.

The shares are being sold at $23.50 per share.

RBS will see its stake in Citizens cut from more than 70 per cent to somewhere between 41.9 per cent and 45.6 per cent.

Ross McEwan, RBS chief executive, said: "The sale of Citizens is an integral part of the RBS capital plan. It will help us to create a stronger, safer, UK focused bank that can better serve the needs of its customers.

"This successful sale keeps RBS on track to meet our obligations and complete the divestment of Citizens by the end of 2016."

Citizen shares floated on the New York Stock Exchange in September at a price of $21.50.

Separately, the Treasury has sold further shares in Lloyds Banking Group, taking its holding in the lender to less than 22 per cent.

The latest disposal, equivalent to around one per cent of Lloyds, netted The Treasury more than £500m.