If you are a national from one of the following countries, you do NOT require a Schengen Visa to go to Greece, PROVIDING your visit does not exceed 3 months.

Andorra El Salvador Nicaragua
Argentina Guatemala Panama
Australia Honduras Paraguay
Bolivia Israel San Marino
Brazil Japan Singapore
Brunei Macao South Korea
Canada Malaysia United States of America
Chile Mexico Uruguay
Costa Rica Monaco Vatican
Croatia New Zealand Venezuela

Embassy information:

1A Holland Park
London W11 3TP
020 7229 3850 (Visa Information 24 hour line: 09065 508 983 - calls cost 1 per minute)
Website

Opening hours:
Mon-Fri 9.30-13.00
Visa collection: Mon-Fri 12.00-13.00