The Bank of England is the central bank of the United Kingdom and has a similar role to that of the Federal Reserve in the US and the ECB in the Eurozone. It's main task is financial stability but it...
No the Bank of England does not own any part of RBS. Before the banking collapse RBS was owned by various organisations and individual shareholders. Since then RBS has been given money from the UK...
It varies from country to country. Every country has a central bank that is the bank for other banks in the country. Ex: Federal reserve system - USA Reserve Bank - India etc