(Reuters) - A rebound in bank stocks after the U.S. Federal Reserve's guarded stance on future interest rate cuts lifted London's FTSE 100 on Thursday, with investors shifting focus to the Bank of England's policy decision due later in the day.The blue-chip index erased its early losses and was up 0.4% at 0845 GMT. The FTSE 250 index was up 0.2%.A sub-index of banks broke its three-day losing streak with a 1.2% rise. CMC Markets analyst Michael Hewson said the Fed's signal to hold back on..