I wish to find out the Advertising Agency that handles the promotion
for the World Cup.I assume it is based in Europe.Alternatively the
person responsible for promotion within FIFA.

The lead agency for the FIFA World Cup is actually a part of the FIFA.
I have listed contact information below along with links to further
information.

Key words Used:
 
FIFA web site 
://www.google.com/search?hl=en&lr=&ie=ISO-8859-1&newwindow=1&safe=off&q=FIFA+website&btnG=Google+Search


That located the FIFA web site:
http://www.fifa.com/

From there the FIA Marketing Link connects with:
http://a1801.g.akamai.net/f/1801/2004/3d/www.fifa.com/infoplus/IP-250a-E-WC-partners.pdf

and the site reports that, after the bankruptcy of the ISMM Group in
2001, all marketing operations are now coordinated through the 100%
FIFA controlled FIFA Marketing Ltd. The following contact information
is in that document.
 
FIFA Marketing Ltd.
P.O. box 4250
Grafenauweg 2
CH-6304 Zug/Switzerland

Phone (+41) 41 – 727 00 00
Fax     (+41) 41 – 727 00 11


Members of the Media Committee are listed at:
http://www.fifa.com/committee/dir/index_E.html

but you really want the marketing arm at FIFA Marketing Ltd.

The main address for the Federation Internationale de Football
Association is:

FIFA House
P.O. Box 85
8030 Zürich,
Switzerland 

Websites that may interest you:

Yahoo is in charge of the official 2002 World Cup Web site and their
lead PR agency is Black Rocket Euro RSCG and the press release is at:
http://biz.yahoo.com/prnews/020528/nytu115_2.html

Good luck with your efforts.