By David Milliken LONDON (Reuters) -The Bank of England looks set this week to slow the 100 billion-pound-a-year pace at which it reduces its government bond holdings following increased volatility in bond markets, while keeping its main interest rate on hold. Although the central bank views the pace of quantitative tightening as having little impact on the wider economy, it is closely watched by financial markets, where some blame it for pushing up British government borrowing costs. The BoE is alone a ...