By David Milliken LONDON (Reuters) – The Bank of England looks set to take its first steps next week towards selling some of the 875 billion pounds ($1.11 trillion) of government bonds it amassed between 2009 and 2021, leading markets into uncharted territory. Investors believe the BoE, seeking to prevent the recent jump in inflation from becoming a long-term problem, will raise its main interest rate on May 5 to 1%, the level at which it has said it will be “considering beginning” outright bond sales. The big question for markets is when these sales will start. Analysts’ estimates range from …