FTSE knocked by falling commodity shares

By Alistair Smout and Kit Rees LONDON (Reuters) - UK shares underperformed Europe stocks on Tuesday, giving up early gains after a drop in commodity-related items intensified and banks turned lower following the Bank of England's latest financial stability report. The blue-chip FTSE 100 index was down 0.58 points, flat in percentage terms, at 6,105.90 points by the close, lagging blue-chip euro zone stock market indexes. Metal prices fell after the dollar strengthened ahead of a speech by Federa