Today's fine for RBS pushes the bill for past bad behaviour over an enormous £4 billion.
It appears the Chancellor will announce a cap on business rate rises and a shift away from subsidising on-shore wind farms and solar energy.
Royal Bank of Scotland boss Ross McEwan admitted that it had failed to invest properly in systems for decades.
Technology firm Hewlett-Packard has not denied claims by the Unite union that 1,100 jobs are at risk in the UK:
Sources at Hewlett Packard not denying 1,100 jobs at risk across UK, say they're consulting on numbers
Technology giant Hewlett-Packard plans to cut 1,100 jobs at the start of 2014 in Bracknell, Sheffield and Warrington, said the Unite union.
The European Commission said it is "determined to fight and sanction" rate-rigging cartels formed by some banks.
Vice president of competition policy Joaquin Almunia said:
Today's decision sends a clear message that the Commission is determined to fight and sanction these cartels in the financial sector.
Healthy competition and transparency are crucial for financial markets to work properly, at the service of the real economy rather than the interests of a few.
The sanctions - the first from the European Commission on rate manipulation - are the highest yet for European anti-trust enforcement.
Barclays is immune from a potential €690 million (£573 million) penalty after the bank blew the whistle on the Euribor cartel.
The Euribor is the euro area equivalent of the London interbank offered rate (Libor).
RBS fine is 391 million euros - latest in a long line of costs for past bad behaviour
RBS, Barclays, Deutsche Bank found to have acted as a 'cartel' over euro interest rates
Eight banks fined total of 1.7 billion euros for market rigging - ouch
Eight major banks have been fined a combined €1.7 billion (£1.4 billion) by the European Commission over interest rate-rigging.
The European Commission is expected to announce more fines for banks over the rate-rigging scandal, as ITV News business editor Laura Kuenssberg writes:
Hear euro banks fines for market rigging out at 11.30 in brussels - told some banks braced for up to 800 million euro penalties
The European Commission is set to fine a group of banks a record €1.7 billion (£1.4 billion) for rigging interest rates, Reuters reported, citing a source.