How great are Bloc Party? Great enough that 1) they are the greatest band you have never heard of 2) witz.org desperately contacted Ultragrrrl after we heard their new single - simply because she mentioned them on her website and she might be able to tell us more about them 3) they have a video I can’t stop watching.
No plans for this band to come to the US anytime soon, but you should be able to satisfy your jones with the following MP3s. Or buy the import single for “Little Thoughts :

Bloc Party MP3s :
“She’s Hearing Voices”
“Staying Fat”
For even more information, read their All Music Guide Entry