The FTSE 100 Index has closed 11.8 points higher at 5478.8 after reports that the US Federal Reserve, Bank of Japan and Bank of England were drawing up plans to cushion the blow of a Greek default.
The London market kept its head above water on hopes that central banks globally are ready to act if this weekend's election in Greece ultimately leads to the debt-laden country leaving the euro.
The pound was up against the euro at 1.23 as the single currency weakened ahead of Sunday's Greek poll, while sterling was also ahead against the US dollar at 1.56.
Banks are "willing" to get behind a £80 billion new funding scheme but experts warn there is no guarantee it will kick-start lending.
Despite the plans to inject an estimated £80 billion to get banks lending again, it is back to square one for home buyers, at best.
The Chancellor and the Governor of the Bank of England are to press the button on a plan that was to be used at times of economic 'stress'