By Lars Mucklejohn London markets, lead by the FTSE 100, received a boost on Thursday morning following a strong performance from US stocks and the Bank of England watering down proposals for new bank capital rules. The blue-chip FTSE 100 jumped 1.01 per cent at 8,276.64, while the mid-cap FTSE 250, which is more closely aligned with the health of the UK economy, rose 1.15 per cent to 20,773.38 The S&P 500 closed 1.07 per cent higher on Wednesday, helped by fresh consumer price index (CPI) data that has all but secured the US Federal Reserve’s first rate cut in four years next week. US inflati…