The United Kingdom elected 73 Members of the European Parliament using proportional representation.
The United Kingdom was divided into twelve multi-member constituencies.
The eleven of these regions which form Great Britain used a closed-list party list system method of proportional representation, calculated using the D'Hondt method.
Northern Ireland used the Single Transferable Vote (STV).
As a result of the Treaty of Lisbon coming into force, the UK became entitled to a 73rd MEP as from November 2011.
The Electoral Commission performed a reallocation in keeping with the same procedures it used to allocate 72 MEPs; an extra Conservative MEP was allocated to the West Midlands constituency, based on the 2009 vote, and was enshrined in the European Union Act 2011 as an amendment of the European Parliamentary Elections Act 2002.

¹ Includes Gibraltar, the only British overseas territory which was part of the European Union.
The United Kingdom elected 73 Members of the European Parliament using proportional representation. The United Kingdom was divided into twelve multi-member constituencies. The eleven of these regions which form Great Britain used a closed-list party list system method of proportional representation, calculated using the D'Hondt method. Northern Ireland used the Single Transferable Vote (STV). As a result of the Treaty of Lisbon coming into force, the UK became entitled to a 73rd MEP as from November 2011. The Electoral Commission performed a reallocation in keeping with the same procedures it used to allocate 72 MEPs; an extra Conservative MEP was allocated to the West Midlands constituency, based on the 2009 vote, and was enshrined in the European Union Act 2011 as an amendment of the European Parliamentary Elections Act 2002.
¹ Includes Gibraltar, the only British overseas territory which was part of the European Union.
2014 European Parliament election in the United Kingdom