I could not make it but here are impressions of tablaqueen who was lucky to be there:
"[...] They put all the lights and fog on when he came on so you couldn't really see - everyone hollered when a figure in a top hat appeared... only then we noticed that the whole band was wearing them - which looked pretty cool, but they lost them later - and then finally Serj appeared himself. Wearing a cream top hat and cream coat, white shirt and black trousers.
He actually did look quite like a ringleader and the way he behaved onstage was a bit ring-leaderish too. He had the odd mental moment but mostly he was fairly calm, just making pronouncements in sort of typical Serj fashion every so often. Anyway. He didn't play that long really, but then he hasn't got loads of solo material yet, and i gather he refuses to play any System stuff.
He did a fantastic cover of Holiday in Cambodia, which was a bit lost on the young ones in the crowd, but us old farts were dancing around to it ;), and then he said -Hey, we're in London so i have to do a Beatles song!' er, did no one ever tell Serj the Beatles were from Liverpool? i was a bit doubtful about the Beatles song but he actually did it really well - partly Beatles ish and partly mental metal style, finishing off with that howler monkey noise that death metal singers do.
So that was pretty cool. Unfortunately, i don't know the name of the song - unless there is a song called Girl? it was one i recognise but don't know that well.
i noticed on the quieter songs mostly no one waves lighters about anymore - now it's thousands of camera phones instead... i'm quite pleased about that as the lighter waving always makes me think of Bryan Adams. One or two did have them - if i'd been near them i would have blown the darn things out. One doesn't wish to be reminded of Bryan Adams at a Serj concert after all.
i did wish i had had the presence of mind to bring an Armenian flag along to wave about at him - i don't have one, but i could perhaps have made one - some others in the bottom crowd did have one and were flapping it about - i was quite jealous! [...]"