On Feb 1, 9:14 pm, "David Mitchell" wrote:

Visible to the south east after 0800 today. Only a small patch but the first
I've seen for some time.

Are you sure it wasn't iridisation in some high cirrus?

It is the right time of year for them so it may have been a display.

I didn't see it. Did anyone get photographs of them? That would be
helpful.
Can anyone confirm if they were in fact lenticular stratospheric
nacreous clouds?
They do have a very aerodynamic wind swept characteristic shape.

Some pictures from the big display of 1996 on my webpage (together
with a list of all known UK displays for the past century)

http://www.nezumi.demon.co.uk/nacreous/nacreous.htm

They form usually at such a high altitude as to be visible over a very
wide area.

Regards,
Martin Brown