Ken Livingstone, the current mayor of London, has publicly stated that he backs the return of the Parthenon Marbles to Greece.

From:
[1] Macedonian Press Agency

FRIDAY, 25 JUNE 2004
THE MAYOR OF LONDON BACKS THE RETURN OF THE PARTHENON MARBLES TO GREECE
London, 25 June 2004 (14:36 UTC+2)

London’s Mayor Ken Livingston stated, during a special ceremony held in the London City Hall yesterday on the occasion of PASOK President Giorgos Papandreou visit within the framework of the efforts for the promotion of the Olympic Truce, that his views on the issue of the Marbles are very clear, stressing that he believes that it is right for the Parthenon Marbles to return to the place of their heritage.

The Mayor of London expressed certainty that the Athens Olympic Games will enjoy an unbelievable success and stated that he is proud because he will have the chance to represent London in this great event.