European stocks slumped in afternoon trading ahead of a meeting of eurozone finance ministers to agree on the next tranche of aid for Greece.
The state of banks' financial health remains "obscure" and means they should be avoided by investors for now, Liontrust's Jan Luthman has said.
Shares in Barclays led the FTSE 100 leader board today as investors reacted to an upgrade from Goldman Sachs.
The UK's accounting rules are distorting bank profits and leading to confusion over executive pay, some of the country's largest investors have have warned.
David Cameron has issued one of his strongest defences of the banking sector yet, telling the Lord Major's banquet those who "trash the banks would end up trashing Britain".
Barclays has appointed Rory Tobin, former head of iShares International, to work on reviewing the group's asset management arm.
High street bank staff who missed sales targets were named and shamed, forced to work late and threatened with the sack, according to the Unite union.
US regulators have proposed a $470m fine for Barclays after the bank was found to have manipulated the American electricity market.
Barclays shares have fallen after the bank revealed it is facing two new US regulatory investigations into its conduct.
A care home group is suing Barclays for £37m over the rigging of LIBOR in a landmark case which could force the bank to disclose the names of managers involved in the scandal.