The Nevermore backdrop was small enough for Islington. The problem is not the size of the backdrop, it's the position of the rigs in the venue. The rigs at the Mean Fiddler (Astoria 2) were not high enough, the ones at the Islington Academy are high enough but what they use to hold backdrops is not at the very back. So the bands have the option of putting the backdrop all the way up but having less space on stage OR hanging the backdrop from the middle (like Nevermore did) and having more space. Last time Overkill played in Islington a couple of months ago the backdrop was all the way up and it looked fucking wicked!
I think the Islington Academy should invest some money in solving this problem as it looks very unprofessional to hang a backdrop from the middle. Backdrops are important in my opinion.