Hmm, Hanover Square? I didn't see a square near the church. I may have passed Hanover Square on the ride to the church. I took a taxi from Brighton Station and was in a rush to get to the venue before it opened. I got there in plenty of time, and when the doors did open, I staked a good spot inside the church in which to take photos and video. After the show, I rushed in a taxi back to the train station so I could take one of the last trains out of Brighton for the night.
Yeah, I'm not familiar with England... just Googled the church by name and found an image that (from the outside) looked very similar. Anyway, it sounds like it was in Brighton... thanks for your geography lesson