FTSE 100 suffers worst single-day sell-off since May as banks brace for tax raid Markets The FTSE 100 has suffered its biggest single-day drop since May as European markets are hit by a continent-wide rout in the bond markets, which has pushed western government borrowing costs to multi-decade highs. London’s blue-chip index dropped by two per cent in early trading, erasing all its gains from the third quarter in a [...]