clouds from Durham, England.
Alex Lloyd-Ribeiro imaged these on June 23rd 2006 at 02:00 UT.
They show the characteristic pattern of streaks with smaller billows.
Look at the fine structure with binoculars to distinguish NLCs from lower clouds. The latter lose detail with magnification, NLCs less so.
The same clouds from 60 miles to the south.
Image ©Alex Lloyd-Ribeiro, shown with permission.