Haven't see any NLCs since July 9th/10th which is shocking, however this is more to do with cloud cover than anything else. The season will soon be ending so fingers crossed for another good one before it's over for another year. The best display of 2011 so far for me was on July 9th/10th, Roisin and I spent the night at the north coast watching it glowing over the sea and the infamous 17th century ruins of Dunluce Castle which made for a fantastic NLC experience. Here's a detailed report on my site with many more images....
http://www.nightskyhunter.com/Dunluce%20Castle%20Noctilucent%20Clouds%20-%20July%2010th%202011.html