The UK CAA publishes a book/CDROM called CAP555 overseas flight clearance guide, this has all the required regulations/contacts
Contact - Overseas Non-Scheduled Flight Clearances Guide
Address: Aeronautical Information Service
National Air Traffic Services Ltd
Control Tower Building
London Heathrow Airport
Hounslow
Middlesex
TW6 1JJ
United Kingdom
Fax (H24): +44 (0) 20 8745 3453
Foreign Library: +44 (0) 20 8745 3471
UK NOTAM Office: +44 (0) 20 8745 3450/3451
Central Pre Flight Bulletin (PIB) Section:+44 (0) 20 8745 3464
UK Publications Office: +44 (0) 20 8745 3456
AIS Website:
www.ais.org.uk
CD-ROM Support: +44 (0) 20 8745 3456
Rgds,
Deing