shepherds bush is unseated stalls, balcony seats & 'the gods'...Personally I think SB Empire is a cracking little venue and I far prefer the standing area downstairs to the unreserved seating upstairs. Although I'm 50 and have arthritis in one knee, I find that strolling around with a plastic pint of overpriced beer, while listening to some great music, keeps all the right senses properly lubricated!
For those of a more sedentary nature, you can buy seats (try also
http://www.ticketweb.co.uk), but they're unreserved, so you'll need to arrive at the gigs early to snag the best available view. There are bars upstairs too, but if you blanched at the thought of standing at a rock gig, you may prefer to bring a thermos of Horlicks and a rug for your knees!

(Only kidding; I know we're all different!)
For those in or around London, it's possible to avoid booking fees by paying cash in person at the box office of either SBE (16.00-19.00 on days when there's a gig on) or O2 Islington Academy (before 16.00 Mon-Sat); unsure if you can buy via other O2 venues.
Got my tickets for both nights yesterday; see you all there?