Despite having to s...p...e...l...l it really slowly for our Southern Cousin
Yep, we slowly spell 'damnyankee' as one word where I come from
...
I saw the clouds over Denmark from FL390 around 2130Z last night, they were great. They appeared to be in the deep twilight of the sunset to the northwest.
Last month I saw a nice display over the UK in the northern glow that you get at those latitudes within a few weeks of the summer solstice.
Here are some other recent reports of sitings, including last night's display:
http://www.nlcnet.co.uk/nlcreps.htm#latest
Also, the Wikipedia article has some good links, some of the slowly spelled text from the first post on this thread seems to be lifted from this article without attribution:
http://en.wikipedia.org/wiki/Noctilucent_clouds