THQ (UK) LTD
DUKE COURT
DUKE STREET
WOKING SURREY
GU21 5BH
phone: 01483 724 500
company reg. No 2703913
THQ is an international company with their Head Office in America:
THQ Corporate Headquarters
THQ Inc.
29903 Agoura Road
Agoura Hills, CA 91301
Phone: (818) 871-5000
If you don't get any joy out of their UK organisation either contact them on +1 818 871 5000 using one of the cheap access numbers to the USA or send them an email via their US website:
http://www.thq.com/contact/ By the way, their UK website is registered by the US organisation.