Not sure how good I am at writing reviews, but here goes!
As background, Old Grey Whistle Test ran I think from late 60's till around 1985. Bands performed live on the show. The U2 clip shown last night was from 1981, probably before October came out as behind Larry's drum kit was large poster of Boy album cover.
They played 11 O'Clock Tick Tock which was performed pretty much how it has been performed lately, though Edge's guitar was not as prominant as it has been on recent versions, a little bit more jangley towards the end, without the raw aggression, while lyrically, it was pretty standard. However, the song did last a bit longer than usual, with various Edge solo's and Bono mumblings. Was a great performance and was really interesting seeing the band from around this era. Not sure how much live material people have seen from 80-82 period. Other than I will Follow from best of, this is probably the only other clip I have seen of the band performing live and even then, they seemed totally beyond their years. Bono was VERY into the performance, lots of enthusiasim, like he was living the song while singing it, lots of Bono dancing (who else do u know can dance like Bono!) that seemed totally out of beat with everything around him..
Anyway, hope this helps!