By David Milliken and William Schomberg LONDON (Reuters) -The Bank of England should raise rates faster than it has so far because sterling’s weakness is adding to Britain’s inflation pressures, interest-rate setter Catherine Mann said on Monday. Mann – who voted unsuccessfully for a half-point increase in interest rates last week – said the U.S. Federal Reserve’s latest tightening plans, and the likelihood of similar moves from the European Central Bank, were pushing down on sterling. “In my view, a more robust policy move … reduces the risk that domestic inflation already embedded is furth…