I'm not going to write an entry for every song the band have ever covered live, or even the just the ones that have been released on live albums, because that would still require me to buy a whole bunch of those and I ain't made of money. But if they've been released on singles, whether they're the a or the b-side, they'll get an entry. So, "Fake Plastic Trees".
Just to cement the Radiohead comparisons the album received, this was the b-side to the only single to come out of Radiation. It stays extremely faithful to the original, so I'm kind of at a loss for what to actually say about it. I don't know, Hogarth's vocal delivery is somewhat less slurred than Yorke's. That's a difference, I guess. I don't think it affects my enjoyment of the song one way or another, it's great either way.
I suppose if you want to play someone else's song live because you love it, without trying to put your own spin on it or whatever, that's probably OK from time to time, but it really shouldn't be b-side material.
Video: Fake Plastic Trees
There's no 'tube of the Marillion version, but the original's much the same, so that'll do. It's got a pretty nice video.