LONDON (Reuters) – British government borrowing costs hit a 20-year high on Wednesday after Bank of England Governor Andrew Bailey told pension funds they had three days to fix liquidity problems before the bank withdrew emergency bond-buying support. The country’s financial markets have been in turmoil since finance minister Kwasi Kwarteng last month unveiled tax cuts with no details of how they would be paid for. Following is a snapshot of related events, comments and explanations: WHAT’S BEHIND THE CRISIS? * The Bank of England has been forced into emergency bond-buying to stem a sharp sell…