The FTSE 100 index was in better shape, adding 25.2 points to 5000.2, propped up by yesterday's gains on Wall Street. But stubbornly high oil prices, straining towards $60 a barrel, are limiting the upside. All eyes will be on Iran tomorrow, where the Opec is due to hammer out new production quotas. But even if it increases output, some cartel officials believe it will do little to curb prices.