Nacreous cloud

Spent most of today slaving over a paintbrush, as I foolishly resumed decorating the spare room. Between that task and going out for a meal with a friend, I noticed that the sky went quite dramatically from overcast to bright, just prior to sunset. There were some interesting clouds and light effects including this sunburst as well as what, as an amateur cloud-spotter, I believe to be a nacreous cloud. if you can cast any further light on this, please let me know.