After a rapid drop of 1.9% in previous session, British FTSE 100 index retreated and climbed 0.5% on Wednesday as investors awaited results of a Greek debt swap agreement. Mining sectors recovered from losses with Kazakhmys PLC adding 2.6% and Eurasian Natural Resources Corp gaining 2.3%. Admiral Group PLC jumped 10% on better than expected pre-tax profit for 2011. On the downside oil shares fell amid surging oil prices. Cairn Energy PLC lost 1.2% and Royal Dutch Shell slipped 0.2%. At the moment of writing FTSE trades 0.49% or 28.04 points higher at 5,793.64.