By David Milliken LONDON (Reuters) -The Bank of England should move very gradually to tighten monetary policy because the economy now appears to be slowing faster than previously thought, incoming BoE policymaker Swati Dhingra said on Wednesday. Britain’s central bank has raised interest rates five times since December, mostly in quarter-point increments, but a minority of policymakers have called for bigger moves of half a percentage point to tackle soaring inflation. One of those policymakers is Michael Saunders, who Dhingra will succeed after August’s Monetary Policy Committee meeting. Dhin…