UK bank Virgin Money would look at buying assets from up-for-sale Co-operative Bank, its head said today, after the group reported operating profit rose by a third last year. 

Rescued from the brink of collapse by a group of hedge funds in 2013, Britain's Co-op bank is seeking a buyer after struggling to meet regulatory capital requirements. 

Its purchase would add four million customers to any bank's books. 

"The bank has not approached anybody in Co-Op Bank yet,... but at some point we will look at this strategic opportunity," Virgin Money's chief executive Jayne-Anne Gadhia told Reuters. 

She did not specify whether Virgin Money would want to buy the whole business or seek to cherry pick certain assets. 

Virgin Money today highlighted resilient demand from borrowers following Britain's vote to leave the European Union, and Gadhia said the bank had not tightened any lending criteria. 

Its underlying pretax profit rose to £213.3m in 2016, up from £160.7m the previous year. 

Gross mortgage lending rose 12% to £8.4 billion in the year, giving the so-called challenger bank a 3.4% share of a UK mortgage market dominated by larger players. 

However, the lender's impairment charges increased to £37.6m from £30.3m, with most of the rise coming in its credit card business, which the firm attributed to a jump in its credit card lending by 55%t to £2.4 billion. 

The bank, which listed on London's main market in 2014, said, it was sufficiently nimble to adjust to changes in the operating environment as timing and nature of Britain's exit from the EU remains unclear. 

The lender said it added more than 35,000 customers per month to its books, mainly through its digital channels. Over 82% of its sales were through digital channels. 

However, Gadhia said that the bank was committed to maintaining its existing branch network.