Since England, ( including Scotland, Wales, and Northern Ireland ) is a member of the EU, English citizens vote in EU elections. 
England does not have proportional representation in the House of Commons, but EU elections use proportional representation.
EUROPEAN UNION
EUROPEAN PARLIAMENT ELECTION OF 13 JUNE 2004
=============================================
Sources: ARCOS website

VOTING BY MEMBER STATE
======================

BRITAIN
========

Parties
----------------------------------------------------------------
* Conservative Party: affiliated
with the European People's Party -
European Democrats (EPP-ED)
* Democratic Unionist Party (DUP): unaffiliated
* Green Party: affiliated with the Green -
European Freedom Alliance (Green-EFA)
* Labour Party (PES): affiliated with the
Party of European Socialists (PES)
* Liberal Democrats: affiliated with the
European Liberal Democratic and Reform Party (ELDRP)
* Plaid Cymru (Party of Wales, PC): affiliated with
the Green - European Freedom Alliance (Green-EFA)
* Scottish National Party (SNP): affiliated with
the Green - European Freedom Alliance (Green-EFA)
* Sinn Fein (Ourselves Alone): unaffiliated
* UK Independence Party (UKIP): affiliated with the
Group for a Europe of Democracies and Diversities (GEDD)
* Unionist Party of Northern Ireland: affiliated with
the European People's Party - European Democrats (EPP-ED)
------------------------------------------------------------------------
Registered voters: 45,309,760
Valid votes: 16,992,677 37.5
------------------------------------------------------------------------
Party Votes % Change Seats
------------------------------------------------------------------------
* Conservative Party 4,397,090 26.7 -09.0 27 -8
* Democratic Unionist Party 175,761 01.0 -00.8 1
* Green Party 1,028,283 06.3 00.0 2
* Labour Party 3,718,683 22.6 -05.4 19 -6
* Liberal Democrat 2,452,327 14.9 +02.3 12 +2
* Ourselves Alone 144,541 00.8 1 +1
* Party of Wales 159,888 01.0 -00.9 1
* Scottish National Party 231,505 01.4 -01.3 2
* United Kingdom Independence Party 2,650,768 16.1 +09.2 12 +10
* Unionist Party of Northern Ireland 91,164 00.5 -00.6 1
* Others 1,942,667 11.4 -
----------------------------------------------------------------------------
Total 16,992,677 78 -9


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Psephos: Adam Carr's Election Archive
   http://psephos.adam-carr.net/

Just click on [B] for Britian.  Or just explore the site.

Jack Stewart