Various commentators seem to be suggesting that after the 31st of March 2017 (next year) invoking Article 50 of the Lisbon Treaty to exit the EU will cease to be an automatic right for all EU member states and will require a qualified majority vote (QMV) in the European Council.
In other words, we had better have triggered Brexit by then or we may not be able to. And other countries wanting to leave in the future may find it much harder than us.
But is this analysis true? Here is the full text of the Lisbon Treaty, you work it out...