LONDON, Jan 23 (Reuters) - The European Central Bank will be more aggressive than previously thought in its tightening campaign, adding another 50 basis points to its deposit rate on Feb. 2, as it continues its battle against rampant inflation, a Reuters poll found.

      Although the euro zone's central bank has been raising rates at its fastest pace on record it has so far failed to bring inflation anywhere near its 2% target. Prices rose 9.2% in December on a year earlier, official data showed last week.