Bones, I've finally had time to investigate my mountains at EGNS and I found the problem. When I installed the UK2000 Part 7 scenery I decided I preferred your EGNS and so renamed Gary's EGNS files to [filename].xbgl This worked fine for ages. Then when I first got the mountains I thought it must be your IOM scenery so I disabled it. This week I found I still had the mountains. Today I've tried various disablements of FS scenery files and tracked the problem down to UK2000 Part 7. On examining the folder the penny dropped! I had at some time installed the Part 7 update which included some new .BGLs for EGNS. These were causing the problem. I've now renamed them to .XXBGLs and flatness is now restored to EGNS. I guess I need to write myself a list of reminders of the adjustments I've made, so that installing updates includes checking on this stuff. Frank T.