Hi Jaf,
When I first created the terrain, the camera was above the terrain - the issue was that when I re-opened the project, the terrain had changed - it is possible as bobbystahr points out that I might have used a different seed, and it defaulted to the standard setting - something that needs addressing by Planetside, as all fields should be saved with the project - I am going to try again, changing the seed, but making a record of it. Thanks for giving it a try though. I will report back!
Jonathan