Miners rebounded from yesterday's falls to lead the way in early trading this morning, driving the FTSE 100 up 22.3 points (0.4%) to 5,784.
The FTSE 100 has opened 0.06% or 3.24 points lower to 5,774 in early trading as rises in retail stocks were offset by falling mining shares.
The FTSE climbed 0.9%, or 49 points this morning, boosted by British Airways and mining stocks.
Broker downgrades and companies going ex-dividend pulled the FTSE index 25 points, or 0.4% lower this morning.
A decision by the US Federal Reserve to keep interest rates on hold boosted sentiment in London this morning.
The Dow Jones closed higher at 10611.81, up 44.51 points (0.42%), marking its third day of rises and its highest closing level since January 19.
The FTSE 100 opened flat following a mixed performance in the US overnight. The UK index was up 0.07% or 3.07 points to 5,610.
Financials rose this morning, but could not prevent the FTSE falling 0.2%, or 8.8 points to 5475.28.
The FTSE opened marginally higher this morning, rising by 18.7 points, or 0.4%, to 5333.79.
The FTSE opened more than 30 points higher Tuesday thanks in part to an 11% share price jump for builders' supplier Wolseley.