Giles has been an MEP for Devon and East Plymouth since 1994, becoming MEP for the South West of England in 1999 and for South West England and Gibraltar in 2004 and 2009.
He was elected a Vice-President of the European Parliament from July 2011 to January 2012 and has been Deputy Leader of the Conservatives in the European Parliament since November 2010.
He was Chairman of the European Parliament's Delegation for relations with Australia and New Zealand in 2007-08 and 2008-09.
He has been personally responsible for several important Reports within the Industry, Research and Energy Committee since 1999.
The Directive on Units of Measurement extended the period for allowing dual marking in imperial and metric until end 2009. Getting the proposal adopted at 1st Reading was a legislative first post the 1997 Amsterdam Treaty. The Directive was extended indefinitely in 2008.
Next was the Green Paper on Security of Supply of Energy in Europe, of great importance for Europe's future energy needs.
Then the Measuring Instruments Directive replaced ten previous directives establishing common standards.
He was Rapporteur for the Directive on Security of Electricity Supply and Infrastructure Investment, adopted at 1st Reading in mid 2005.
He was Rapporteur for the Agency for the Cooperation of Energy Regulators which was adopted on 12 June 2009, which sought to give regulators as much power as possible to try and break down forms of monopoly.
He was Rapporteur for the Energy Community Treaty which involved the setting up of an internal market for energy in South-East Europe based upon the EU single market model.
Giles is also involved in a number of interest groups covering specific issues on a cross-party basis. He has been President of the European Energy Foundation since 2004, after serving as Vice-President between 1995 and 2004. (visit the EEF website) and First Vice-President of the Ciel & Espace Intergroup (Aerospace) 2001-2004.