No change: England governed as the UK by the Westminster parliament
Devolution: English parliament and government with responsibilities and powers similar to the current Scottish ones
Federation without national sovereignty: England is recognised as a self-governing nation as part of a new federal UK; but ultimate sovereignty remains with the UK parliament
(Con)federation with national sovereignty: England is an autonomous nation with complete sovereignty over its own affairs but delegating certain matters (e.g. defence) to a federal British government
