After two years of trying to solve the "institutional impasse", EU leaders agreed, on 18 October 2007, on the new EU Treaty at an informal summit in Lisbon. However, some last-minute requests and red lines had to be catered for before the deal was struck:
- The UK and Poland opted out of the Charter of Fundamental Rights.
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Poland managed to include the so-called Ioannina clause in a Protocol. This allows for a minority of member states to delay key decisions taken by qualified majority in the Council "within a reasonable space of time", even if they do not constitute a blocking minority. However, the clause is not included in the actual Treaty text, which means that member states can alter this provision without having to go through the cumbersome procedure of treaty change.
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Italy obtained an extra seat in the European Parliament, putting it back on an equal footing with the UK, but giving it one seat less than France.
- The UK defended its "red lines" and received wide-ranging opt-outs on cooperation in justice and home affairs.