Your best starting point at the CAA would probably be the Safety Regulation Group at Gatwick. If they cannot help you directly, they should be able to point you in the direction of the correct department.
Safety Regulation Group
Civil Aviation Authority
Gatwick Airport South
T: 01293 567171
You may also wish to have a look at Section 4.4 Obstacles - Marking & Lighting of the CAA publication CAP437 Offshore Helicopter Landing Areas - Guidance on Standards
which is available to download here.
17 January 2005 at
11:23 PM by