London has nine Members of the European Parliament, all elected to  represent London as a whole.  Labour has two London MEPs:

Mary Honeyball MEP
Write to Mary at: 49 Shirland Mews, London W9 3DY
Email: mary@maryhoneyball.net
Phone: 020 8964 9815
Fax: 020 8960 0150
Website

Claude Moraes MEP
Write to Claude at:  65 Barnsbury Street, London N1 1EJ
Phone: 020 7609 5005
Fax: 020 7607 8299
email: mep@claudemoraes.net
Website