Whilst watching Shells today on Sky One I thought that two of the used sets seemed familiar and I just wanted to know if they were used previously on the show. These are the parts I mean.

1. When Illyria and Knox are in that big hall and Wesley shoots Knox. I think it's the Hyperion but obviously not as the Hyperion.

2. When Illyria and Wes go through the portal to where Illyria's army should have been. I think it was that big open space where Angel talked to Darla about her soul in Dear Boy.

Can some please tell me whether or not I'm imagining it.

I didn't notice that when I was watching the episode, but thinking back to it, it seems quite likely. They re-use sets all the time, e.g. the sunnydale high corridor was also the UC Sunnydale corridor or something like that. From memory of what the sets look like, what you've said is probably the case. Good observation!